Numerical investigation on the flow and heat transfer of a multi-lobe particle and equivalent spherical particles in a packed bed with considering the wall effects

2018 ◽  
Vol 138-139 ◽  
pp. 350-367 ◽  
Author(s):  
Davood Toghraie ◽  
Masoud Afrand ◽  
Ali Deris Zadeh ◽  
Hamid Amuali Akbari
Keyword(s):  
Heat Transfer ◽  
Numerical Investigation ◽  
Packed Bed ◽  
Spherical Particles ◽  
Wall Effects ◽  
Flow And Heat Transfer

Flow and Heat Transfer Characteristics Inside Packed and Fluidized Beds

1998 ◽  
Vol 120 (3) ◽  
pp. 667-673 ◽  
Author(s):  
C. C. Wu ◽  
G. J. Hwang
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Fluidized Beds ◽  
Packed Bed ◽  
Equation Model ◽  
Spherical Particles ◽  
Heat Transfer Characteristics ◽  
Particle Reynolds Number ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer

This paper investigates experimentally and theoretically the flow and heat transfer characteristics inside packed and fluidized beds. A single-blow transient technique combined with a thermal nonequilibrium two-equation model determined the heat transfer performances. Spherical particles were randomly packed in the test section for simulating the packed beds with porosity ε=0.38 and 0.39. Particles were strung with different spaces for fluidized beds with ε = 0.48 ~ 0.97. The ranges of dominant parameters are the Prandtl number Pr = 0.71, the particle Reynolds number Red = 200 ~ 7000, and ε = 0.38 ~ 0.97. The results show that the heat transfer coefficient increases with the decrease in the porosity and the increase in the particle Reynolds number. The friction coefficients of the fluidized beds with ε = 0.48 and 0.53 have significant deviations from that of the packed bed with ε = 0.38 and 0.39. Due to fewer interactions among particles for ε = 0.97, the friction coefficient approaches the value of a single particle.

Numerical Investigation of Flow and Heat Transfer around Two Semi-Circular Cylinders with a Splitter Plate

2011 ◽  
Vol 42 (7) ◽  
pp. 595-612
Author(s):  
Masome Heidary ◽  
Mousa Farhadi ◽  
Kurosh Sedighi ◽  
Mostafa Nourollahi
Keyword(s):  
Heat Transfer ◽  
Numerical Investigation ◽  
Splitter Plate ◽  
Circular Cylinders ◽  
Flow And Heat Transfer
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