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유동층의 열전달기구에 관하여
Mechanism of Heat Transfer to Fluidized Beds
HWAHAK KONGHAK, August 1965, 3(2), 151-158(8), NONE
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Abstract
In order to determine the mechanism of heat transfer to fluidized beds, heat transfer coefficients were measured in the bubble bed, the gas-liquid and the gas-solid fluidized beds. And the rate of mixing measured by a solid tracer technique, and the fluidization quality including bubble frequency and number of density fluctuation per unit time by leak current meter in the gas-solid fluidized bed were correlated.
A semi-theoretical equations to predict heat transfer coefficients in those systems were found, and compared with experimental results.
The equations are as fallwos;
i） Gas-solid fluidized bed
h= 2/π-1/2·（kmρbmc(uo/L）)-1/2 (20)
Developing the model of the packet, relation with heat transfer coefficient, h, and the rate of mixing, Wm, was obtained as follows
h=CvWm （19）
ii） Bubble bed and gas-liquid-solid fluidized bed
h = log （μΦ/uo）·(2/π-1/2)·(kmρmuo /L)-1/2 (23)
A semi-theoretical equations to predict heat transfer coefficients in those systems were found, and compared with experimental results.
The equations are as fallwos;
i） Gas-solid fluidized bed
h= 2/π-1/2·（kmρbmc(uo/L）)-1/2 (20)
Developing the model of the packet, relation with heat transfer coefficient, h, and the rate of mixing, Wm, was obtained as follows
h=CvWm （19）
ii） Bubble bed and gas-liquid-solid fluidized bed
h = log （μΦ/uo）·(2/π-1/2)·(kmρmuo /L)-1/2 (23)
