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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EFFECT OF SURFACE MORPHOLOGY ON SUBCOOLED FLOW BOILING UNDER THE TYPICAL CONDITION OF INTERNAL COMBUSTION ENGINES

Fei Dong
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

Taotao Cao
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

Liuwendi Hou
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

Decai Song
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

DOI: 10.1615/IHTC16.bae.022433
pages 721-729


KEY WORDS: IC engines, Heat transfer enhancement, Subcooled flow boiling, Surface morphology, Response surface methodology

Abstract

The surface morphology of the cooling channel plays an important role in boiling heat transfer, but it is often neglected in modern internal combustion (IC) engine cooling systems. In this paper, the subcooled flow simulations on structured surface with different cavity configurations were carried out under the typical engine condition. The calculated heat flux of subcooled flow boiling on the structured surface was found to be larger than that on the plain surface under different conditions validated by experimental results of Liu. The vapor volume fraction and velocity distributions above plain and structured heating surface were compared to explicate the enhancement mechanism of boiling heat transfer. The response surface approximation model with the average error of 4.5% and R2 of 96.3 was established based on the Computational Fluid Dynamic (CFD) results. The effects of geometric parameters such as cavity spacing, cavity diameter and cavity depth on heat flux were quantitatively examined with above approximation model.

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