Heat fluxes in the surface air layer with decomposition of initial components onto different scales

2021 ◽  
Keyword(s):  
Heat Fluxes ◽  
Surface Air Layer

Heat Fluxes in the Surface Air Layer with Decomposition of Initial Components into Different Scales

2021 ◽  
Vol 34 (6) ◽  
pp. 658-671
Author(s):  
V. A. Gladkikh ◽  
I. V. Nevzorova ◽  
S. L. Odintsov
Keyword(s):  
Heat Fluxes ◽  
Surface Air Layer

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

OBSERVATION ON HEAT FLUXES ABOVE THE TERRESTRIAL SURFACES IN THE CENTER OF URBAN AREA AND THE BAY IN TOKYO

1994 ◽  
Vol 59 (463) ◽  
pp. 65-73 ◽  
Author(s):  
Hidetaka KOMIYA ◽  
Tatsuo OKA ◽  
Taizou SHIMOKAWA ◽  
Hiroyuki AKAGAWA ◽  
Junn SUGIYAMA
Keyword(s):  
Urban Area ◽  
Heat Fluxes
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