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 evaporator temperature, temperature distribution and cooling power using only inlet gas properties as input variables. To achieve this, the model incorporated changing gas properties due to heat transfer within the heat exchanger and isenthalpic 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. Two types of microcoolers differing in inner tube material, poly-ether-ether-ketone (PEEK) and stainless steel, were tested and simulated. CO2 was used as the coolant gas in the calculations and experimental trials 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. Comparisons to experiments show that the model was successfully able to obtain a good degree of accuracy. 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.
Skip Nav Destination
ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5450-1
PROCEEDINGS PAPER
Theoretical Study of a Flexible Wiretype Joule Thomson Micro-Refrigerator for Use in Cryosurgery Available to Purchase
Adhika Widyaparaga,
Adhika Widyaparaga
Kyushu University, Fukuoka, Japan
Search for other works by this author on:
Masashi Kuwamoto,
Masashi Kuwamoto
Kyushu University, Fukuoka, Japan
Search for other works by this author on:
Naoya Sakoda,
Naoya Sakoda
Kyushu University, Fukuoka, Japan
Search for other works by this author on:
Masamichi Kohno,
Masamichi Kohno
Kyushu University, Fukuoka, Japan
Search for other works by this author on:
Yasuyuki Takata
Yasuyuki Takata
Kyushu University, Fukuoka, Japan
Search for other works by this author on:
Adhika Widyaparaga
Kyushu University, Fukuoka, Japan
Masashi Kuwamoto
Kyushu University, Fukuoka, Japan
Naoya Sakoda
Kyushu University, Fukuoka, Japan
Masamichi Kohno
Kyushu University, Fukuoka, Japan
Yasuyuki Takata
Kyushu University, Fukuoka, Japan
Paper No:
FEDSM-ICNMM2010-30127, pp. 591-598; 8 pages
Published Online:
March 1, 2011
Citation
Widyaparaga, A, Kuwamoto, M, Sakoda, N, Kohno, M, & Takata, Y. "Theoretical Study of a Flexible Wiretype Joule Thomson Micro-Refrigerator for Use in Cryosurgery." Proceedings of the ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B. Montreal, Quebec, Canada. August 1–5, 2010. pp. 591-598. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30127
Download citation file:
7
Views
Related Proceedings Papers
Related Articles
Theoretical and Experimental Study of a Flexible Wiretype Joule–Thomson Microrefrigerator for Use in Cryosurgery
J. Heat Transfer (February,2012)
Heat Transfer of Supercritical Carbon Dioxide in Printed Circuit Heat Exchanger Geometries
J. Thermal Sci. Eng. Appl (September,2011)
Related Chapters
How to Use this Book
Thermal Spreading and Contact Resistance: Fundamentals and Applications
Natural Gas Transmission
Pipeline Design & Construction: A Practical Approach, Third Edition
Cooling of Steel Spherical Balls by Natural Convection and Radiation Heat Transfer in Unsteady State
Electromagnetic Waves and Heat Transfer: Sensitivites to Governing Variables in Everyday Life