抄録
The performance of a Joule-Thomson cooler is dependent on the performance of its heat exchanger. Experimental trials have revealed an optimum length of heat exchanger where increasing the heat exchanger dimensions further does not improve performance. To estimate this optimum heat exchanger length in the design of the Joule-Thomson microcooler, we have developed a model capable of predicting the performance characteristics of a wiretype Joule-Thomson microcooler utilizing analytical methods and incorporating changing gas properties via gas equations of state. The resulting model estimates the optimum heat exchanger length well. From the model it has also been revealed that the optimum heat exchanger length is shortened by the long capillary which functions as a secondary heat exchanger.
