An experimental study of flow and heat transfer characteristics of natural convection heat transfer from a horizontal heated surface with a heated cylinder

Rikio Shimoyama, Akihiko Horibe, Naoto Haruki

Research output: Contribution to journalArticle

Abstract

Natural convection heat transfer from an upwards-facing horizontal heated surface above which a heated cylindrical pipe was placed was estimated experimentally. The purpose of this study was to clarify the effects of the basic parameters on the flow characteristics with a cylindrical heater, and to determine available factors to enhance the heat transfer from the horizontal heater. The parameters estimated were the distance between the horizontal heater and the cylindrical heater, and the size and heat flux of each heater. Flow characteristics have three distinct patterns: no reversed flow, reversed flow that reaches the horizontal heater, and reversed flow that does not reach the heater. Heat transfer was enhanced using the cylindrical heater. In the cases of no reversed flow and reversed flow not reaching the horizontal heater, the heat transfer enhancement increased with the modified Rayleigh number of the cylindrical heater. In the range of low numbers, the reversed flow reaching the heater provided heat transfer enhancement.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
DOIs
Publication statusAccepted/In press - Jul 26 2017

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Engine cylinders
Natural convection
heaters
free convection
reversed flow
heat transfer
Heat transfer
flow characteristics
Heat flux
Pipe
augmentation
Rayleigh number
heat flux

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "Natural convection heat transfer from an upwards-facing horizontal heated surface above which a heated cylindrical pipe was placed was estimated experimentally. The purpose of this study was to clarify the effects of the basic parameters on the flow characteristics with a cylindrical heater, and to determine available factors to enhance the heat transfer from the horizontal heater. The parameters estimated were the distance between the horizontal heater and the cylindrical heater, and the size and heat flux of each heater. Flow characteristics have three distinct patterns: no reversed flow, reversed flow that reaches the horizontal heater, and reversed flow that does not reach the heater. Heat transfer was enhanced using the cylindrical heater. In the cases of no reversed flow and reversed flow not reaching the horizontal heater, the heat transfer enhancement increased with the modified Rayleigh number of the cylindrical heater. In the range of low numbers, the reversed flow reaching the heater provided heat transfer enhancement.",
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