TY - JOUR
T1 - Heat transfer and fluidization characteristics of a high-temperature shallow fluidized bed
AU - Aihara, Toshio
AU - Maruyama, Shigenao
AU - Tanaka, Keiji
AU - Yamaguchi, Jyun'ichi
N1 - Funding Information:
Enya, and Mr. K. Oohori of Ishikawajima-Harima Heavy Industries Co. Ltd., for their assistance in constructing the high-temperature wind tunnel. The research was carried out with a Grant-in-Aid for Scientific Research on Priority Areas 003-D01 of the Ministry of Education, Science and Culture of Japan.
PY - 1993/4
Y1 - 1993/4
N2 - Experiments were carried out on the heat transfer and fluidization characteristics of a very shallow fluidized bed at high temperatures. Argon, helium, and air were used as working gases, and zirconia beads and silicon carbide particles were used as solid particles. In the experiment at a medium temperature range (bed temperature Tb ≤ 680 K), heat transfer characteristics with various particle materials and gases correlated well with the dimensionless variables calculated from the thermophysical properties at the temperature of gas jets from a multislit distributor. These dimensionless data showed good agreement with Andeen and Glicksman's empirical formula. As the operating temperature was increased (Tb ≥ 680 K), the fluidization deteriorated; then the heat transfer coefficient decreased very rapidly; finally, fluidization stopped completely. In some cases the fluidization recovered when the gas temperature was decreased. This phenomenon may be attributed to the impurities from thermal insulation material. It should be noted that the impurity content in working gas, even though only a small fraction, is very detrimental to the fluidization and heat transfer characteristics of a very shallow fluidized bed operated at a high temperature.
AB - Experiments were carried out on the heat transfer and fluidization characteristics of a very shallow fluidized bed at high temperatures. Argon, helium, and air were used as working gases, and zirconia beads and silicon carbide particles were used as solid particles. In the experiment at a medium temperature range (bed temperature Tb ≤ 680 K), heat transfer characteristics with various particle materials and gases correlated well with the dimensionless variables calculated from the thermophysical properties at the temperature of gas jets from a multislit distributor. These dimensionless data showed good agreement with Andeen and Glicksman's empirical formula. As the operating temperature was increased (Tb ≥ 680 K), the fluidization deteriorated; then the heat transfer coefficient decreased very rapidly; finally, fluidization stopped completely. In some cases the fluidization recovered when the gas temperature was decreased. This phenomenon may be attributed to the impurities from thermal insulation material. It should be noted that the impurity content in working gas, even though only a small fraction, is very detrimental to the fluidization and heat transfer characteristics of a very shallow fluidized bed operated at a high temperature.
KW - fluidization
KW - fluidized bed
KW - high temperatures
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U2 - 10.1016/0894-1777(93)90069-U
DO - 10.1016/0894-1777(93)90069-U
M3 - Article
AN - SCOPUS:0027579871
VL - 6
SP - 282
EP - 291
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
IS - 3
ER -