Transient Heat Transfer Between Two Horizontal Pipelines in a Heat Tracing Enclosure

C.J. Ho, G.N. Sou and Chi-Ming Lai
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C.J. Ho: Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
G.N. Sou: Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Chi-Ming Lai: Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan

Energies, 2019, vol. 12, issue 8, 1-14

Abstract: In this study, a numerical simulation of natural convection between two horizontal differentially heated pipelines inside a circular air-filled enclosure is performed using the finite difference method. The relevant parameters of the problem are the inclinations of the two cylinders (positioned vertically in this study, with the cold cylinder above the hot cylinder), the distance between cylinders and the Rayleigh number. The results show that transient irregular fluctuations in the flow field and heat transfer occur when the Rayleigh number increases or the distance between cylinders decreases. Under the current test conditions, increasing the Rayleigh number significantly increases the average heat transfer coefficient between the cold and hot cylinders.

Keywords: heat tracing; natural convection; enclosure flow; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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