A correlation for natural convection heat transfer from inclined plate-finned heat sinks

Tarı, İlker
Steady-state natural convection heat transfer from inclined plate-finned heat sinks to air is numerically investigated by using an experimentally validated model. The heat sinks with parallel arrangement of uniform rectangular cross section plate fins are inclined from the vertical in both forward and backward directions in order to investigate the effect of inclination on convection. Our previously validated numerical model for vertically oriented heat sinks is directly used without changing any model parameters, but only by varying the direction of the gravitational acceleration to create the effect of inclination. The flow and temperature fields are resolved using a finite volume computational fluid dynamics code. Performing a large number of simulations for the heat sink base inclination angles of +/- 4 degrees, +/- 10 degrees, +/- 20 degrees, +/- 30 degrees, +/- 45 degrees, +/- 60 degrees, -65 degrees, -70 degrees, +/- 75 degrees, +/- 80 degrees, +/- 85 degrees, +/- 90 degrees from the vertical, the dependence of the convective heat-transfer rate to the inclination angle and Rayleigh number is investigated. Scale analyses are performed in order to generalize estimates for the convection heat-transfer rates. A single correlation is suggested and shown to be valid for a very wide range of angles from -60 degrees (upward) to +/- 80 degrees (downward) in a wide range of Rayleigh numbers from 0 to 2 x 10(8).


İnci, Aykut Barış; Bayer, Özgür (2019-01-01)
Geometrical optimization of heat sinks with square, cylindrical and plate fins for heat transfer increase is numerically analyzed in transition regime external flow. The relations between the thermal characteristics of fins and boundary conditions such as free-stream velocity are investigated. Experimental studies are performed by using manufacturable fins to validate the numerical model. Heat transfer correlations are derived in order to determine average heat transfer coefficients over a certain range of ...
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Tarı, İlker (2013-01-01)
The steady-state natural convection from heat sinks with parallel arrangement of rectangular cross section vertical plate fins on a vertical base are numerically investigated in order to obtain a validated model that is used for investigating inclined orientations of a heat sink. Taking a previous experimental study as a basis, aluminum heat sinks with two different practical lengths are modeled. The models and the simulation approach are validated by comparing the flat plate heat sink results with the avai...
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Citation Formats
M. MEHRTASH and İ. Tarı, “A correlation for natural convection heat transfer from inclined plate-finned heat sinks,” APPLIED THERMAL ENGINEERING, pp. 1067–1075, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47045.