Effects of Surface Modifications on Heat and Fluid Flow Characteristics in Fluid Jets Impinging on a Heated Surface

2005 ◽  
Keyword(s):  
Fluid Flow ◽  
Heated Surface ◽  
Flow Characteristics ◽  
Surface Modifications ◽  
Fluid Jets ◽  
Fluid Flow Characteristics ◽  
Heat And Fluid Flow

Heat and Fluid Flow Inside Rotating Channels

1994 ◽  
Vol 47 (8) ◽  
pp. 367-396 ◽  
Author(s):  
Wen-Jei Yang ◽  
Shin Fann ◽  
John H. Kim
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Fluid Flow ◽  
Flow Characteristics ◽  
Rotating Machinery ◽  
Channel System ◽  
Rotating Systems ◽  
Fluid Flow Characteristics ◽  
Heat And Fluid Flow ◽  
Rotating Channel

Power generation and refrigeration accomplished by means of rotating or reciprocating machinery. One of the basic elements of rotating machinery is the rotating channel system. With the desire for ever increasing efficiency in power generation and refrigeration, higher or lower operating temperatures are achieved. It has provided motivation for the pursuit of knowledge on heat transfer and fluid flow characteristics. This paper reviews the literature pertinent to studies of fluid flow and/or heat transfer in channel flows subjected to radial rotation, parallel rotation, and coaxial revolution. Special problems unique to rotating systems are discussed and future study areas are suggested.

Effects of Upstream Geometry on Natural Convection of a Darcian Fluid About a Semi-Infinite Inclined Heated Surface

1985 ◽  
Vol 107 (2) ◽  
pp. 283-292 ◽  
Author(s):  
C. T. Hsu ◽  
P. Cheng
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Natural Convection ◽  
Inclination Angle ◽  
Transfer Rate ◽  
Heated Surface ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Fluid Flow Characteristics ◽  
Inclined Surface

The method of matched asymptotic expansions is applied to the problem of steady natural convection of a Darcian fluid about a semi-infinite inclined heated surface with a power law variation of wall temperature, i.e., Tˆwaxˆλ for xˆ≥0 where 0≤λ<1. The leading edge of the inclined surface intercepts at an angle, Λ0, with another impermeable unheated surface extending upstream. The effects of the inclination angle α0 (0 ≤ α0 < < π/2) of the heated surface as well as the upstream geometry at xˆ<0 (as specified by Λ0) on heat transfer and fluid flow characteristics near the heated surface are investigated. At a given inclination angle α0, it is found that heat transfer from an upward-facing heated inclined surface is larger than that of a downward-facing heated surface, and that decreasing the intercepting angle (Λ0) tends to lower the heat transfer rate. These effects become increasingly pronounced as the Rayleigh number is decreased.

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