## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### Experimental study on the correlation of subcooled boiling flow in horizontal tubes

**ABSTRACT**

Subcooled boiling is the most effective form of heat exchange in the water jacket of the cylinder head. Chen's model is the most widely used correlation for predicting boiling heat transfer, but the selection of the correlation for the nucleate boiling is controversial. The work of this paper is to simulate the heat transfer process in the water jacket of the cylinder head with a horizontal rectangular channel that is heated on one side. Using the coolant flow velocity, inlet temperature and system pressure as variables, the heat flux and heat transfer coefficient were obtained. The results show that the increase of the coolant flow velocity can effectively promote the convection heat transfer, and the change of inlet temperature and system pressure will affect the occurrence of nucleate boiling. However, the Chen's model predictions doesn't fit well with the experimental data. Four nucleate boiling correlations were selected to replace Chen's model nucleate boiling correlation. The correlation proposed by Pioro coincides best with the experimental data. The mean error after correction is 18.2%.

**KEYWORDS**

PAPER SUBMITTED: 2020-08-01

PAPER REVISED: 1970-01-01

PAPER ACCEPTED: 2020-10-31

PUBLISHED ONLINE: 2020-12-05

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