11-11-2014, 12:23 PM
Abstracts: The modelling of a complete pulse tube refrigerator is not so easy due to non-linear, unsteady and oscillating flow through different passages particularly regenerator, orifice valve and double inlet valve. So, it has been tried to develop a time dependent theoretical model based on ideal behaviour of gases to understand the basic phenomena responsible for the production of cold effect. There are many advantages of pulse tube cryocoolers over Stirling cryocoolers associated with the absence of moving parts in the cold head. Efficiencies have been improved considerably in the last few years to where they equal or even exceed the efficiencies of Stirling cryocoolers. The use of inertance effects and double inlets to improve the efficiencies will be discussed. Inertance Tube Pulse Tube Refrigerator (IPTR) is a class of rugged and high-endurance refrigeration system that operates without a moving part at their low temperature end. The thermo-fluidic processes in IPTR are complicated and the details of the mechanisms underlying their performance are not well understood with experimental technique.To get an optimum parameter experimentally is a very tedious for inertance pulse tube refrigerator job , so that the CFD approach gives a better solution which is the main purpose of the present work.