Experimental study on direct contact condensation of saturated steam at low mass flux in subcooled quiescent water

IF 0.4 4区工程技术 Q4 NUCLEAR SCIENCE & TECHNOLOGY Kerntechnik Pub Date : 2022-08-10 DOI:10.1515/kern-2021-1059

M. A. Kaleem, Ajmal Shah, M. Iqbal, A. Quddus, Atif Mehmood, A. Riaz, M. K. Ayub

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Abstract

Abstract The phenomenon of saturated steam jet injection in subcooled quiescent water has many practical applications including in heat exchangers, steam jet pumps, steam dumping systems in nuclear plants, etc. The experimental setup is designed and fabricated indigenously to investigate this phenomenon at lower mass fluxes ∼120 and 150 kg/m2 s. The steam jet of conical shape has been observed for all the test conditions. The recorded axial temperature distribution showed that near the nozzle region, the temperature is governed by the saturated condition of steam while the later region is dependent on the water pool temperature. The maximum temperature is observed to be at the center of the jet. It has been found that the dimensionless penetration length of the steam jet in water is directly dependent on both the temperature of the water pool and the mass flux of steam. The dimensionless jet length has been found in the range ∼1.54–2.02 and 2.07–2.19 for mass fluxes ∼120 and 150 kg/m2 s, respectively. The average heat transfer coefficient has been found in the range ∼1.97–2.37 MW/m2 K.

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过冷静水中低质量通量饱和蒸汽直接接触冷凝实验研究

摘要过冷静水中饱和蒸汽喷射现象在热交换器、蒸汽喷射泵、核电站蒸汽倾倒系统等方面有许多实际应用。实验装置是自行设计和制造的，目的是在较低的质量通量(120和150 kg/m2 s)下研究这一现象。在所有试验条件下均观察到锥形蒸汽射流。记录的轴向温度分布表明，喷嘴区域附近的温度受蒸汽饱和状态控制，而喷嘴区域的温度则取决于水池温度。观测到的最高温度在喷流的中心。研究发现，蒸汽射流在水中的无因次穿透长度与水池温度和蒸汽质量通量直接相关。在质量通量为~ 120和150kg /m2 s时，无量纲射流长度分别为~ 1.54 ~ 2.02和2.07 ~ 2.19。平均传热系数在~ 1.97 ~ 2.37 MW/m2 K之间。

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来源期刊

Kerntechnik 工程技术-核科学技术

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Kerntechnik is an independent journal for nuclear engineering (including design, operation, safety and economics of nuclear power stations, research reactors and simulators), energy systems, radiation (ionizing radiation in industry, medicine and research) and radiological protection (biological effects of ionizing radiation, the system of protection for occupational, medical and public exposures, the assessment of doses, operational protection and safety programs, management of radioactive wastes, decommissioning and regulatory requirements).