VacTran 3 Manual, страница 3

2464 Using...................................................................................................................................permeation data for leak detection2465 General...................................................................................................................................permeation formula2476 Example...................................................................................................................................Calculation2477 Creating...................................................................................................................................permeation libraries2488 Permeation...................................................................................................................................dialog description2499 Dialog...................................................................................................................................commands25010 Opening...................................................................................................................................permeation libraries25011 Permeation...................................................................................................................................library format251Part XIV O-Ring Libraries2521 Why...................................................................................................................................use an o-ring library?2522 Caveats...................................................................................................................................

2523 Creating...................................................................................................................................o-ring libraries2534 O-ring...................................................................................................................................library dialog description2555 O-ring...................................................................................................................................compression2566 Dialog...................................................................................................................................commands2567 Opening...................................................................................................................................existing o-ring libraries2568 O-ring...................................................................................................................................library file format258Part XV Pipe libraries2591 Why...................................................................................................................................use a pipe library?2592 Pipe...................................................................................................................................library creation2603 Pipe...................................................................................................................................Library Dialog description2614 Dialog...................................................................................................................................commands2625 Opening...................................................................................................................................Existing Pipe Libraries2636 Pipe...................................................................................................................................library file format264Part XVI Gas Models2651 Creating...................................................................................................................................gas models2662 Dialog...................................................................................................................................description2683 How...................................................................................................................................gas variables affect calculations2694 Calculating...................................................................................................................................Mean Free Path vs.

Pressure2705 Opening...................................................................................................................................existing gas models2716 Format...................................................................................................................................for gas model files272Part XVII Default Settings273© 2011 Professional Engineering ComputationsContents91 Graph...................................................................................................................................Controls dialog274..........................................................................................................................................................Graph controls help..........................................................................................................................................................Preset Styles..........................................................................................................................................................Gallery..........................................................................................................................................................Background colors..........................................................................................................................................................Titles..........................................................................................................................................................Axis type..........................................................................................................................................................Updates..........................................................................................................................................................Line style..........................................................................................................................................................Fonts..........................................................................................................................................................Grid style..........................................................................................................................................................Log scales..........................................................................................................................................................Linear scales..........................................................................................................................................................Points..........................................................................................................................................................Border..........................................................................................................................................................Legend..........................................................................................................................................................Shadows..........................................................................................................................................................Export Graph2 Units...................................................................................................................................of measure dialog2762772782792802812822832842852862872882892902912922933 Environment...................................................................................................................................dialog - global2954 Environment...................................................................................................................................dialog - system298Part XVIII Calculation Formulas3011 Caveats...................................................................................................................................- calculation formulas3022 Pump...................................................................................................................................down calculation hierarchy303..........................................................................................................................................................Pump down time..........................................................................................................................................................Pump down time for gas loaded system..........................................................................................................................................................Total volume calculations..........................................................................................................................................................Incremental pressure calculations..........................................................................................................................................................Delivered pump speed..........................................................................................................................................................Conductances in series..........................................................................................................................................................Conductances in parallel3 Conductance...................................................................................................................................calculations304304305306307308308309..........................................................................................................................................................The concept of flow regimes310.........................................................................................................................................................Molecular flow conductance312.........................................................................................................................................................Viscous flow conductance313.........................................................................................................................................................Transition flow conductance314.........................................................................................................................................................Sonic flow conductance314.........................................................................................................................................................Mean Free Path315..........................................................................................................................................................The concept of flow randomizers316.........................................................................................................................................................Choosing entrance and exit loss options319.........................................................................................................................................................Examples of selecting entrance and exit losses321..........................................................................................................................................................Transmission probability322.........................................................................................................................................................Entrance transmission probability324.........................................................................................................................................................Body transmission probability324.........................................................................................................................................................Exit transmission probability324..........................................................................................................................................................The concept of equivalent Length325.........................................................................................................................................................Viscous flow equivalent length326.........................................................................................................................................................Viscous entrance equivalent length327.........................................................................................................................................................Viscous body equivalent length329.........................................................................................................................................................Viscous exit equivalent length329© 2011 Professional Engineering Computations910VacTran 3.........................................................................................................................................................Molecular flow equivalent length329.........................................................................................................................................................Summary- geometric equivalency331..........................................................................................................................................................Geometry-specific conductance cases334.........................................................................................................................................................Elbow and miter calculations335.........................................................................................................................................................Bend calculations336.........................................................................................................................................................Rectangle calculations337.........................................................................................................................................................Rectangular pipe efficiency339.........................................................................................................................................................Annulus calculations340.........................................................................................................................................................Annular pipe efficiency342.........................................................................................................................................................Triangle calculations343.........................................................................................................................................................Triangular pipe efficiency345.........................................................................................................................................................Ellipse calculations346.........................................................................................................................................................Elliptical pipe efficiency348.........................................................................................................................................................Comparison of long pipe equations349.........................................................................................................................................................Conical pipe calculations350.........................................................................................................................................................Conical pipe examples355.........................................................................................................................................Long reducing conical pipe356.........................................................................................................................................Long expanding conical pipe358.........................................................................................................................................Short reducing cone360.........................................................................................................................................Short expanding cone3624 Gas ...................................................................................................................................load throughput calculations364..........................................................................................................................................................Out gas calculations..........................................................................................................................................................Permeation calculations..........................................................................................................................................................Exponential out gas calculations..........................................................................................................................................................Affect of decay time on out gas calculationsPart XIX Hand calculating a pump down curve3653663673683701 Hand...................................................................................................................................calculation steps - no gas load372..........................................................................................................................................................Calculate pressure increments..........................................................................................................................................................Calculate conductances..........................................................................................................................................................Calculate average pump speeds..........................................................................................................................................................Calculate delivered speed..........................................................................................................................................................Calculate pump down time2 The ...................................................................................................................................role of the gas load3733743773793833853 Hand...................................................................................................................................calculation steps - with gas load386..........................................................................................................................................................Calculate pump down time with gas load389..........................................................................................................................................................Effect of number of increments392Part XX Glossary3941 Active...................................................................................................................................pump3952 Available...................................................................................................................................range3963 Backing...................................................................................................................................pump speed3974 Choked...................................................................................................................................flow3985 Conductance...................................................................................................................................element4006 Conductance...................................................................................................................................list4017 Conductance...................................................................................................................................model4038 Conductance...................................................................................................................................palette4059 Delivered...................................................................................................................................speed405© 2011 Professional Engineering ComputationsContents1110 Flow...................................................................................................................................regimes40611 Gas ...................................................................................................................................model40712 Gas ...................................................................................................................................load40713 Gas ...................................................................................................................................load rate40814 Gas ...................................................................................................................................load decay time40815 Gas ...................................................................................................................................load start time41016 Gas ...................................................................................................................................load stop time41217 Ideal...................................................................................................................................system41318 Increments...................................................................................................................................