Mechanism of radiative heat transfer between fluidizing particles and a cooled surface in a fluidized bed

Jun Yamada, Yasuo Kurosaki, Takanori Nagai

Research output: Contribution to journalArticle

Abstract

We experimentally investigated the radiation heat transfer occurring in a gas-solid fluidized bed between the fluidizing particles and a cooled heat transfer surface. To evaluate this heat transfer, radiation emitted from fluidizing particles to the cooled surface was measured using an infrared (IR) camera, which is located external to the bed so as not to disturb the bed fluidization. By doing this, the cooled surface was made of transparent CaF 2, and was cooled by air convection. Our results revealed that there exist cooled fluidizing particles adjacent to the surface and they suppress the radiation heat transfer between the surface and high temperature fluidizing particles in the depth of the bed. In addition, the effects of the fluidizing velocities, the radiative characteristics, and the particle diameter on the radiation transfer were clarified.

Original languageEnglish
Pages (from-to)727-733
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume65
Issue number630
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

radiative heat transfer
Fluidization
Fluidized beds
beds
Heat transfer
heat transfer
Heat radiation
radiation
surface temperature
convection
cameras
Cameras
Infrared radiation
air
Radiation
gases
Air
Gases

Keywords

  • Dispersed medium
  • Fluidized bed
  • Radiative heat transfer
  • Visualization

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

@article{8b1858c5de1c43c9a51f0862b21507f7,
title = "Mechanism of radiative heat transfer between fluidizing particles and a cooled surface in a fluidized bed",
abstract = "We experimentally investigated the radiation heat transfer occurring in a gas-solid fluidized bed between the fluidizing particles and a cooled heat transfer surface. To evaluate this heat transfer, radiation emitted from fluidizing particles to the cooled surface was measured using an infrared (IR) camera, which is located external to the bed so as not to disturb the bed fluidization. By doing this, the cooled surface was made of transparent CaF 2, and was cooled by air convection. Our results revealed that there exist cooled fluidizing particles adjacent to the surface and they suppress the radiation heat transfer between the surface and high temperature fluidizing particles in the depth of the bed. In addition, the effects of the fluidizing velocities, the radiative characteristics, and the particle diameter on the radiation transfer were clarified.",
keywords = "Dispersed medium, Fluidized bed, Radiative heat transfer, Visualization",
author = "Jun Yamada and Yasuo Kurosaki and Takanori Nagai",
year = "1999",
language = "English",
volume = "65",
pages = "727--733",
journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",
issn = "0387-5016",
publisher = "Japan Society of Mechanical Engineers",
number = "630",

}

TY - JOUR

T1 - Mechanism of radiative heat transfer between fluidizing particles and a cooled surface in a fluidized bed

AU - Yamada, Jun

AU - Kurosaki, Yasuo

AU - Nagai, Takanori

PY - 1999

Y1 - 1999

N2 - We experimentally investigated the radiation heat transfer occurring in a gas-solid fluidized bed between the fluidizing particles and a cooled heat transfer surface. To evaluate this heat transfer, radiation emitted from fluidizing particles to the cooled surface was measured using an infrared (IR) camera, which is located external to the bed so as not to disturb the bed fluidization. By doing this, the cooled surface was made of transparent CaF 2, and was cooled by air convection. Our results revealed that there exist cooled fluidizing particles adjacent to the surface and they suppress the radiation heat transfer between the surface and high temperature fluidizing particles in the depth of the bed. In addition, the effects of the fluidizing velocities, the radiative characteristics, and the particle diameter on the radiation transfer were clarified.

AB - We experimentally investigated the radiation heat transfer occurring in a gas-solid fluidized bed between the fluidizing particles and a cooled heat transfer surface. To evaluate this heat transfer, radiation emitted from fluidizing particles to the cooled surface was measured using an infrared (IR) camera, which is located external to the bed so as not to disturb the bed fluidization. By doing this, the cooled surface was made of transparent CaF 2, and was cooled by air convection. Our results revealed that there exist cooled fluidizing particles adjacent to the surface and they suppress the radiation heat transfer between the surface and high temperature fluidizing particles in the depth of the bed. In addition, the effects of the fluidizing velocities, the radiative characteristics, and the particle diameter on the radiation transfer were clarified.

KW - Dispersed medium

KW - Fluidized bed

KW - Radiative heat transfer

KW - Visualization

UR - http://www.scopus.com/inward/record.url?scp=71449084351&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=71449084351&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:71449084351

VL - 65

SP - 727

EP - 733

JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

SN - 0387-5016

IS - 630

ER -