Evaluation of Cooling Performance of Ultrafine Cryoprobes: Effect of Probe Structure on Thermodynamic Properties of Refrigerant

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 526
  • Download : 0
In this study, the effect of the structure of an ultrafine cryoprobe on its cooling performance was evaluated experimentally and numerically. To clarify the thermodynamic characteristics of the refrigerant in the ultrafine cryoprobe, three ultrafine cryoprobes with different dimensions were manufactured. Additionally, a phase change flow model was developed to estimate the refrigerant condition in a microchannel and evaluate the cooling characteristics of an ultrafine cryoprobe. For validating the numerical model, the results were compared with experimental data and a suitable empirical correlation for a two-phase pressure drop was determined. By calculating the refrigerant condition in an ultrafine cryoprobe, it is clarified that large pressure drops occur in the inner tubes and the refrigerant becomes subcooled owing to heat exchange between the flows in the inner and outer tubes. The temperature differences for three different cryoprobes are reproduced by the developed model. By changing the dimensions of the tubes comprising the ultrafine cryoprobes in the calculation, the lowest temperature can be determined. Additionally, freezing experiments are conducted, and the importance of temperature and vapor quality in ultrafine cryoprobes is represented in the time variation of the frozen region.
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Issue Date
2018-06
Language
English
Article Type
Article
Keywords

ADIABATIC CAPILLARY TUBES; 2-PHASE FLOW; PRESSURE-DROP; HEAT-TRANSFER; MODEL

Citation

INTERNATIONAL JOURNAL OF AIR-CONDITIONING AND REFRIGERATION, v.26, no.2

ISSN
2010-1325
DOI
10.1142/S2010132518500207
URI
http://hdl.handle.net/10203/242616
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0