scholarly journals Discussion: “Free Convection Through Vertical Plane Layers—Moderate and High Prandtl Number Fluids” (MacGregor, R. K., and Emery, A. F., 1969, ASME J. Heat Transfer, 91, pp. 391–401)

1969 ◽  
Vol 91 (3) ◽  
pp. 401-402
Author(s):  
F. Landis ◽  
A. Rubel
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Prandtl Number ◽  
Vertical Plane ◽  
High Prandtl Number

Improvement Of Free Convection From Three horizontal Finned Cylinders Fixed Between Two Walls

2018 ◽  
Vol 6 (2) ◽  
pp. 98-114 ◽  
Author(s):  
Hassan K. Abdullah ◽  
Haneen H. Rahman
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Prandtl Number ◽  
Convection Heat Transfer ◽  
Constant Heat Flux ◽  
Heat Fluxes ◽  
Head Orientation ◽  
Outer Diameter ◽  
Gravitational Acceleration ◽  
Convection Heat

Improvement of  free convection heat transfer from three finned cylinders arranged at a triangle shape fixed between two walls has been investigated in this study. Three mild steel finned cylinders fixed between two walls from Pyrex glass have been used as a test rig. It has been changed the spacing between the cylinders (X/D=1,2,3 & S/D=2,4,6) and the head orientation of a triangle to the top under constant heat flux values (38, 254, 660, 1268) W/m2 and compare with case of three finned cylinders arranged in vertical array in line fixed between two wall. The experiments are carried for Rayleigh number (Ra) from (15x103 to 14 x104 ) and Prandtl  number from (0.706-0.714 ). The results indicated an increase in Nu with increasing Ra for all cylinders. Furthermore,hx and Nu increased proportionally with the increasing of cylinder spacings for all heat fluxes. Also the experimental results show the case of triangle arrangement is improvement the heat transfer more than case of vertical arrangement. Heat transfer dimensionless correlating equation is also proposed.              Nomeclature: Ax: surface area(m2), T∞: surrounding temperature(k), D: the outer diameter of fin (m), Kf: the thermal conductivity for air at film temperature(W/m.k), hx: Local convection heat transfer(W/m2.k),  Gravitational acceleration(m/s2), I: Electric current (Amp), Nu: Nusselt number, Pr: Prandtl number

Experimental Research on Heat Transfer Enhancement for High Prandtl-Number Fluid

2005 ◽  
Vol 47 (3) ◽  
pp. 569-573 ◽  
Author(s):  
Shin-ya Chiba ◽  
Masahiro Omae ◽  
Kazuhisa Yuki ◽  
Hidetoshi Hashizume ◽  
Saburo Toda ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Heat Transfer Enhancement ◽  
Experimental Research ◽  
Transfer Enhancement ◽  
High Prandtl Number
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