Enhancement and control of local heat transfer coefficients in a gas flow containing soft magnetic particles

Koichi Hishida, Masanobu Maeda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A novel technique of enhancing and controlling the local heat transfer coefficients from the hot wall to cooling gas flow has been proposed using soft magnetic solid particles in order to reduce the disadvantage of inefficient gas-solid two-phase flow. The characteristics of the flow and local heat transfer were examined in a vertical rectangular channel flow involving ferrite particles 145 μm in diameter. The Reynolds number of the channel flow was set on the order of 104, and the particle mass loading ratio was varied up to 1.6. The result indicated 60% enhancement of heat transfer downstream from the location of the magnet at a mass loading ratio of about 1.6. A further enhancement in heat transfer is provided by increasing the particle mass loading ratio and the magnetic field intensity. The mechanism of heat transfer enhancement can be clarified by considering the increase in the local heat capacity near the heat plate.

Original languageEnglish
Pages (from-to)55-69
Number of pages15
JournalExperimental Heat Transfer
Volume7
Issue number1
Publication statusPublished - 1994 Jan

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heat transfer coefficients
Heat transfer coefficients
gas flow
Flow of gases
heat transfer
Heat transfer
augmentation
particle mass
channel flow
Channel flow
two phase flow
Two phase flow
Specific heat
Magnets
Ferrite
magnetic flux
ferrites
Reynolds number
magnets
Gases

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Cite this

Enhancement and control of local heat transfer coefficients in a gas flow containing soft magnetic particles. / Hishida, Koichi; Maeda, Masanobu.

In: Experimental Heat Transfer, Vol. 7, No. 1, 01.1994, p. 55-69.

Research output: Contribution to journalArticle

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