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SURFACE HEAT TRANSFER CHARACTERISTICS DURING TRANSIENT SPRAY COOLING

Jiameng Tian
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, 28 Xian Ning West Rd. Beilin District, Xi'an 710049, China

Bin Chen
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University

Dong Li
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Zhi-Fu Zhou
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University

DOI: 10.1615/TFEC2017.hte.017326
pages 2097-2100

要約

Spray cooling is widely applied in industry. The mechanism with complicated surface heat transfer is needed to optimize the factors during spray cooling. In the present study, surface heat transfer of transient spray cooling with different cryogens, nozzles, and substrates were investigated. The similarity of dynamic heat flux with different cryogens, nozzles, and substrates was observed, and the dimensionless correlation was proposed by the spray Biot number, which is defined as the ratio between the internal thermal resistance of the substrate and the surface convective heat transfer resistance. Transient cooling could be divided into two stages: fast boiling cooling and film evaporation cooling. Dimensionless Reynolds number Rel and Fourier number Fol were proposed to represent the maximum heat flux (qmax) and the corresponding time (tmax), respectively. By coupling the Jakob number with Rel and the droplet Weber number (We), dimensionless correlations of maximum heat flux and the corresponding time were proposed, through which it is indicated that We number was the key factor in spray cooling.

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