TY - JOUR
T1 - Development of production system of cryogenic micro-slush particles using a two-fluid nozzle
AU - Ishimoto, Jun
N1 - Funding Information:
The authors would like to thank Prof. Katsuhide Ohira (IFS, Tohoku University, Japan) for his helpful discussions. This research was supported by a Grant-in-Aid for Scientific Research (C. No. 20360082) from the Ministry of Education, Science and Culture, Japan, and also by TEPCO Research Foundation, Japan.
PY - 2008/12
Y1 - 2008/12
N2 - A production system for cryogenic fine micro-slush nitrogen particles is developed using a two-fluid atomization nozzle to apply micro-slush as a refrigerant for long-distance high temperature superconducting cables (HTS); a process that is expected to result in an extensive improvement in effective cooling performance for super-conducting systems. The principle of the micro-slush production nozzle and the performance of the nozzle investigated by Particle Image Velocimetry (PIV) measurement are herein presented. We mainly focus on the development of a new type of superadiabatic two-fluid ejector nozzle, which is capable of generating and atomizing solid nitrogen using liquid-gas impingement of a pressurized subcooled liquid nitrogen (LN2) flow and by a low-temperature, high-speed gaseous helium (GHe) flow. In addition, we constructed a micro-slush particle production system using this new type of two-fluid nozzle and then investigated the effect of the mass flow rate of GHe on the characteristics of the micro-slush two-phase atomizing flow by PIV. The results of this research show that it is possible to produce fine micro-slush nitrogen particles using this newly developed two-fluid nozzle under high-speed atomizing flow conditions, and by applying the appropriate mass-flow rate of subcooled LN2 and cryogenic GHe. Based on the optimized thermal flow conditions of cryogenic micro-slush particulate atomizing two-phase flow and the practical use of its multi-phase functionality, utilization in the development of a new type of superconducting cooling system is predicted.
AB - A production system for cryogenic fine micro-slush nitrogen particles is developed using a two-fluid atomization nozzle to apply micro-slush as a refrigerant for long-distance high temperature superconducting cables (HTS); a process that is expected to result in an extensive improvement in effective cooling performance for super-conducting systems. The principle of the micro-slush production nozzle and the performance of the nozzle investigated by Particle Image Velocimetry (PIV) measurement are herein presented. We mainly focus on the development of a new type of superadiabatic two-fluid ejector nozzle, which is capable of generating and atomizing solid nitrogen using liquid-gas impingement of a pressurized subcooled liquid nitrogen (LN2) flow and by a low-temperature, high-speed gaseous helium (GHe) flow. In addition, we constructed a micro-slush particle production system using this new type of two-fluid nozzle and then investigated the effect of the mass flow rate of GHe on the characteristics of the micro-slush two-phase atomizing flow by PIV. The results of this research show that it is possible to produce fine micro-slush nitrogen particles using this newly developed two-fluid nozzle under high-speed atomizing flow conditions, and by applying the appropriate mass-flow rate of subcooled LN2 and cryogenic GHe. Based on the optimized thermal flow conditions of cryogenic micro-slush particulate atomizing two-phase flow and the practical use of its multi-phase functionality, utilization in the development of a new type of superconducting cooling system is predicted.
KW - Atomization
KW - Cryogenics
KW - Micro-slush particle
KW - Multiphase flow
KW - Superconducting cable
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U2 - 10.1016/j.icheatmasstransfer.2008.07.011
DO - 10.1016/j.icheatmasstransfer.2008.07.011
M3 - Article
AN - SCOPUS:56349132163
SN - 0735-1933
VL - 35
SP - 1235
EP - 1240
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
IS - 10
ER -