Numerical investigation on the single phase forced convection heat transfer characteristics of TiO2 nanofluids in a double-tube counter flow heat exchanger

2011 ◽  
Vol 38 (2) ◽  
pp. 218-228 ◽  
Author(s):  
H. Demir ◽  
A.S. Dalkilic ◽  
N.A. Kürekci ◽  
W. Duangthongsuk ◽  
S. Wongwises
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Investigation ◽  
Single Phase ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Heat Transfer Characteristics ◽  
Counter Flow ◽  
Flow Heat ◽  
Tio2 Nanofluids

Numerical Investigation of Convection Heat Transfer in Pipes with Sintered Porous Metal Rings

2014 ◽  
Vol 556-562 ◽  
pp. 4275-4279
Author(s):  
De Zhi Yang ◽  
Meng Long Dong ◽  
Xin Wei Lu ◽  
Zhao Yao Zhou
Keyword(s):  
Heat Transfer ◽  
Numerical Investigation ◽  
Turbulence Model ◽  
Single Phase ◽  
Convection Heat Transfer ◽  
Porous Metal ◽  
Transfer Effect ◽  
Convection Heat ◽  
Developed Turbulence ◽  
Metal Rings

Fully developed turbulence single phase convection heat transfer of water in pipes filled with sintered porous metal inner rings or solid inner rings was investigated numerically respectively. Numerical calculations were conducted with the Fluent 6.3 code, using the SST k-ω turbulence model. Comparing to solid-ring turbulator pipes, porous-ring turbulator pipes have better comprehensive heat transfer effect. The maximum PEC for porous-ring turbulator pipes is 4.4 and the PEC of solid-ring turbulator pipes is less than 1. It was also analyzed effect of geometric structures on porous-ring turbulator pipe performance. f/f0 for porous-ring turbulator pipes increases with the increasing of Re while Nu/Nu0 decreases with the increasing of Re ,and PEC decreases with the increasing of Re. With the same Re, if the width of the porous ring is equal to the width of groove, f/f0, Nu/Nu0 increases and PEC decreases with the increasing height of porous ring. When the height of porous ring is constant, the f/f0, Nu/Nu0 and PEC decreases with the increasing height of porous ring under the same Re.

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