The convective instability in a microemulsion Phase-Change-Material slurry layer

Hideo Inaba; Chuanshan Dai; Akihiko Horibe

doi:10.1299/jsmeb.47.126

The convective instability in a microemulsion Phase-Change-Material slurry layer

Hideo Inaba, Chuanshan Dai, Akihiko Horibe

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

In the present experimental study, the stability of Rayleigh-Bénard convection has been investigated in rectangular enclosures filled with microemulsion Phase-Change-Material (PCM) slurry. The PCM slurry exhibited a pseudoplastic non-Newtonian fluid behavior. Hysteresis in convection was clearly observed while the PCM were in a solid phase and in phase changing. The critical Rayleigh number decreases with the PCM mass concentration while the PCM is in phase changing. The fluid temperature at the center of the enclosure showed a time-dependent oscillation during the transition from a heat conduction state to a convection state. The maximum Nusselt number has been observed for all of the slurries while the heating plate was controlled at a temperature that most of PCM was in phase changing.

Original language	English
Pages (from-to)	126-137
Number of pages	12
Journal	JSME International Journal, Series B: Fluids and Thermal Engineering
Volume	47
Issue number	1
DOIs	https://doi.org/10.1299/jsmeb.47.126
Publication status	Published - Feb 2004

Keywords

Convective instability
Hysteresis
Microemulsion
Phase Change Material
Rayleigh-Bénard convection
Subcritical convection

ASJC Scopus subject areas

Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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AB - In the present experimental study, the stability of Rayleigh-Bénard convection has been investigated in rectangular enclosures filled with microemulsion Phase-Change-Material (PCM) slurry. The PCM slurry exhibited a pseudoplastic non-Newtonian fluid behavior. Hysteresis in convection was clearly observed while the PCM were in a solid phase and in phase changing. The critical Rayleigh number decreases with the PCM mass concentration while the PCM is in phase changing. The fluid temperature at the center of the enclosure showed a time-dependent oscillation during the transition from a heat conduction state to a convection state. The maximum Nusselt number has been observed for all of the slurries while the heating plate was controlled at a temperature that most of PCM was in phase changing.

KW - Convective instability

KW - Hysteresis

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KW - Phase Change Material

KW - Rayleigh-Bénard convection

KW - Subcritical convection

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The convective instability in a microemulsion Phase-Change-Material slurry layer

Abstract

Keywords

ASJC Scopus subject areas

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