NDLI: Theoretical and Experimental Study of a Flexible Wiretype Joule–Thomson Microrefrigerator for Use in Cryosurgery

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Widyaparaga, Adhika Kuwamoto, Masashi Sakoda, Naoya Kohno, Masamichi Takata, Yasuyuki
Copyright Year	2012
Abstract	We have developed a model capable of predicting the performance characteristics of a wiretype Joule–Thomson microcooler intended for use within a cryosurgical probe. Our objective was to be able to predict cold tip temperature, temperature distribution, and cooling power using only inlet gas properties as input variables. To achieve this, the model incorporated gas equations of state to account for changing gas properties due to heat transfer within the heat exchanger and expansion within the capillary. In consideration of inefficiencies, heat in-leak from free convection and radiation was also considered and the use of a 2D axisymmetric finite difference code allowed simulation of axial conduction. To validate simulation results, we have constructed and conducted experiments with two types of microcoolers differing in inner tube material, poly-ether-ether-ketone (PEEK) and stainless steel. The parameters of the experiment were used in the calculations. CO2 was used as the coolant gas for inlet pressures from 0.5 MPa to 2.0 MPa. Heat load trials of up to 550 mW along with unloaded trials were conducted. The temperature measurements show that the model was successfully able to predict the cold tip temperature to a good degree of accuracy and well represent the temperature distribution. For the all PEEK microcooler in a vacuum using 2.0 MPa inlet pressure, the calculations predicted a temperature drop of 57 K and mass flow rate of 19.5 mg/s compared to measured values of 63 K and 19.4 mg/s, therefore, showing that conventional macroscale correlations can hold well for turbulent microscale flow and heat transfer as long as the validity of the assumptions is verified.
Starting Page	020903
Ending Page	020909
Page Count	7
File Format	PDF
ISSN	00221481
e-ISSN	15288943
Journal	Journal of Heat Transfer
Volume Number	134
Issue Number	2
DOI	10.1115/1.4004937
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2011-12-13
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cooling Drops Flow (Dynamics) Heat Heat exchangers Heat transfer Joules Leakage Pressure Temperature Temperature distribution Temperature measurement Vacuum
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science

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