Experimental study on process of direct contact phase change heat transfer of steam on subcooled liquid spray

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Abstract The direct contact condensation heat transfer process of saturated steam and subcooled water spray countercurrent was studied experimentally using water as working fluid. The changes of liquid sheet thickness and breaking length under different inlet liquid temperature and the axial and radial temperature distribution of liquid sheet were investigated. The local heat transfer coefficient and total heat transfer coefficient of the liquid sheet were calculated based on the experimental data. The experimental results show that the liquid sheet thickness and breaking length are larger at low inlet liquid temperature during direct contact condensation heat transfer. There is a temperature gradient in the radial direction of the liquid sheet, and the temperature of the surfaces of the liquid sheet is high, and there is a minimum temperature in the center. With the increase of the axial distance of the liquid sheet movement, the temperature of the liquid sheet increases gradually, and the temperature rise of the liquid sheet at the outlet of the nozzle is the fastest. In the process of condensation heat transfer of the whole spray, the temperature rise of the liquid sheet accounts for 80%—85% of the total temperature rise of the spray heat transfer. Therefore, compared with the droplet, the liquid sheet plays a major role in heat transfer. The local heat transfer coefficient at the nozzle exit is the largest and decreases with the increase of axial distance. The experimental results show that the total heat transfer coefficient is much larger than the traditional membrane condensation heat transfer coefficient, which reflects the advantages of direct contact heat transfer such as steam-subcooled liquid spray.

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	HUANG Anyang
	LUO Yiqing
	ZHANG Huishu
	YUAN Xigang

Keywords： direct contact condensation heat transfer liquid sheet nozzle temperature distribution heat transfer coefficient

Received 2021-04-14;

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HUANG Anyang, LUO Yiqing, ZHANG Huishu, YUAN Xigang.Experimental study on process of direct contact phase change heat transfer of steam on subcooled liquid spray[J] Chemcial Industry and Engineering, 2023,V40(2): 57-66

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