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

2013-03-01
MEHRTASH, Mehdi
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).
APPLIED THERMAL ENGINEERING

Suggestions

Natural convection heat transfer from inclined plate-fin heat sinks
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...
EXPERIMENTAL AND NUMERICAL STUDY ON HEAT TRANSFER PERFORMANCE OF SQUARE, CYLINDRICAL AND PLATE HEAT SINKS IN EXTERNAL TRANSITION FLOW REGIME
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 ...
Analysis of Transient Laminar Forced Convection of Nanofluids in Circular Channels
Sert, İsmail Ozan; Sezer Uzol, Nilay; Güvenç Yazıcıoğlu, Almıla; Kakaç, Sadık (2012-11-15)
In this study, forced convection heat transfer Characteristics of nanofluids are investigated by numerical analysis of incompressible transient laminar flow in a circular duct under step change in wall temperature and wall heat flux. The thermal responses of the system are obtained by solving energy equation under both transient and steady-state conditions for hydrodynamically fully developed flow. In the analyses, temperature dependent thermo-physical properties are also considered. In the numerical analys...
A passive cooling system proposal for multifunction and high power displays
Tarı, İlker (2013-02-07)
Flat panel displays are conventionally cooled by internal natural convection, which constrains the possible rate of heat transfer from the panel. On one hand, during the last few years, the power consumption and the related cooling requirement for 1080p displays have decreased mostly due to energy savings by the switch to LED backlighting and more efficient electronics. However, on the other hand, the required cooling rate recently started to increase with new directions in the industry such as 3D displays,...
A numerical study of single-phase convective heat transfer in microtubes for slip flow
Sun, Wei; Kakac, Sadik; Yazicioglu, Almila G. (2007-11-01)
The steady-state convective heat transfer for laminar, two-dimensional, incompressible rarefied gas flow in the thermal entrance region of a tube under constant wall temperature, constant wall heat flux, and linear variation of wall temperature boundary conditions are investigated by the finite-volume finite difference scheme with slip flow and temperature jump conditions. Viscous heating is also included, and the solutions are compared with theoretical results where viscous heating has been neglected. For ...
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.