Enhanced heat transfer in a pyramidal lattice sandwich panel by introducing pin-fins/protrusions/dimples

Pin fins are low aspect ratio rods of circular cross section that are used to enhance heat transfer inside turbine blades. Although modifying the basic circular geometry with numerous shallow depressions (dimples) has been linked with enhanced heat transfer rates, the fluid mechanical mechanisms have remained speculative. Here we investigate numerically the effects of dimples onthe mean and turbulence velocities that lead to increased heat transfer. It has been found that dimples result in an increased turbulence intensity which may possess a greater potential to extract and transport more heat from the pin-fin.

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Enhanced Heat Transfer, Missing Pin, and Optimization for Cylindrical Pin Fin Arrays

Journal of Heat Transfer ◽

10.1115/1.2910727 ◽

1993 ◽

Vol 115 (3) ◽

pp. 576-583 ◽

Cited By ~ 65

Author(s):

B. A. Jubran ◽

M. A. Hamdan ◽

R. M. Abdualh

Keyword(s):

Heat Transfer ◽

Experimental Investigation ◽

Enhanced Heat Transfer ◽

Pin Fin ◽

Line Array ◽

Pin Fins ◽

Pin Fin Arrays

This paper reports an experimental investigation on the effects of interfin spacing, shroud clearance, and missing pin on the heat transfer from cylindrical pin fins arranged in staggered and in-line arrays. The interfin spacing in the span wise direction was so small that the pins were almost touching each other. It was found that the optimum interfin spacing in both spanwise and streamwise directions is 2.5 D regardless of both type of array and shroud clearance used. The effect of missing pin for various interfin spacing arrays was found to be negligible for the in-line array but more significant for the staggered arrays.

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Enhanced Heat Transfer with Short Pin Fins in Hot-Air Anti-Icing System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.525.518 ◽

2014 ◽

Vol 525 ◽

pp. 518-522

Author(s):

Long Peng ◽

Gui Ping Lin ◽

Xue Qin Bu ◽

Lu Qin Liu ◽

Yan Cai

Keyword(s):

Heat Transfer ◽

Experimental Research ◽

Rectangular Channel ◽

Volume Ratio ◽

Enhanced Heat Transfer ◽

The Core ◽

Hot Air ◽

Pin Fins

A new rectangular anti-icing structure with short pin fins is presented in this paper. Detailed experimental research is applied to discussing its heat transfer and enhancement characteristics. The results show that, heat transfer of this anti-icing structure enhances obviously, and the core factor for enhancement is the volume ratio occupied by pin fins in rectangular channel of anti-icing structure.

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