Theoretical and experimental analysis of droplet diameter, temperature, and evaporation rate evolution in cryogenic sprays

被引:86
作者
Aguilar, G [1 ]
Majaron, B
Verkruysse, W
Zhou, Y
Nelson, JS
Lavernia, EJ
机构
[1] Univ Calif Irvine, Whitaker Ctr Biomed Engn, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Beckman Laser Inst & Med Clin, Irvine, CA 92612 USA
[3] Univ Calif Irvine, Dept Chem & Biochem Engn & Mat Sci, Irvine, CA 92697 USA
[4] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia
基金
美国国家卫生研究院;
关键词
atomization; coalescence; heat transfer; nozzle; spray cooling;
D O I
10.1016/S0017-9310(00)00363-X
中图分类号
O414.1 [热力学];
学科分类号
摘要
Cryogenic sprays are used for cooling human skin during selected laser treatments in dermatology. In order to optimize their cooling efficiency, a detailed characterization and understanding of cryogen spray formation is required. Various instruments and procedures are used to obtain mean size (D), velocity (V), and temperature (T) of tetra-fluoroethane spray droplets from straight-tube nozzles. A single-droplet evaporation model is used to predict droplet diameter and temperature as a function of distance from the nozzle, D(z) and T(z), from the values of D, V, and T at the ;nozzle exit, i.e., D-0, V-0, and T-0. In the model, it is assumed that D and V decrease in accordance with the D-2-law, and due to drag force, respectively. To compute T(z), the instantaneous D and V are incorporated into a phase-change heat transfer balance, which includes a heat convection term. The predicted evolutions of T(z) and D(z) are in reasonable agreement with experimental data. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3201 / 3211
页数:11
相关论文
共 36 条
[11]  
GODSAVE GAE, 1953, P 4 INT S COMB, P818
[12]  
Harmon D.B., 1955, J FRANKLIN I, DOI [10.1016/0016-0032(55)90098-3., DOI 10.1016/0016-0032(55)90098-3]
[13]  
HUBBARD GL, 1973, INT J HEAT MASS TRAN, V16, P1003
[14]   GAS PROPERTY EFFECTS ON DROPSIZE OF SIMULATED FUEL SPRAYS [J].
INGEBO, RD .
JOURNAL OF PROPULSION AND POWER, 1991, 7 (04) :467-472
[15]  
INGEBO RD, 1994, 1066154004966696 NAS
[16]  
INGEBO RD, 1991, SPAC CRYOG WORKSH CL
[17]  
INGEBO RD, 1995, P 31 JOINT PROP C CO
[18]  
INGEBO RD, 1993, P 31 AER SCI M EXH A
[19]  
Ingebo RD, 1993, AIAA SAE ASME ASEE 2, P2333, DOI [10.2514/6.1993-2333, DOI 10.2514/6.1993-2333]
[20]  
LEFEBVRE AH, 1989, ATOMIZATION SPRAY, P309