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In this paper the effect of free convection heat transfer around vertical square ducts has been studied experimentally. Inconel heating element is used to heat the duct from the center and thermocouples are mounted on each side to measure circumferential average temperature. Experiments were conducted under constant heat flux conditions. Two ducts are considered with variable side length to study...
An ultra-thin polymer pulsating heat pipe (PPHP) was developed by forming with UV curable polymer resin on polyethylene terephthalate films and hydrofluoroether was used as a working fluid. The casing materials were selected in consideration of compatibility between case materials and the working fluid and also the heat and pressure durability. A new apparatus was constructed to evaluate the thermal...
In order to dissipate heat from future low form factor microelectronic systems the use of piezoelectric blowers has recently attracted a great deal of attention. These zero-mass flow devices comprised of two piezoelectric membranes, whose oscillation frequency and amplitude can be electrically tuned, provide a net positive momentum which can be used to actively cool various device components. In order...
In this investigation, the enhancement of natural convection heat transfer from a pin fin of length 145 mm and diameter of 19.875 mm is examined. An experimental set up has been prepared and experiments were carried out for ten different materials in natural convection mode. Then the same 10 materials were analyzed under the same heat loss conditions with black coat and then a comparative study was...
This paper studies the effects of natural convection on longitudinal heat transfer and on the air-gap thermal resistance of cables inside conduit installations. Oversimplification of the physical placement of cables inside unfilled conduits is the main shortcoming in currently available thermal models. The study closely investigates the share of each heat-transfer mechanism and the effect of the natural...
With the recent advancements in the electronics industry, thinner systems with greater functionality are on demand. Natural convection air-cooling is the method of choice for many low power electronics applications due to cost, availability, and reliability. However, its performance is very limited due to buoyancy dependent weak flow. Therefore, there is a need for further enhancement of natural convection...
Experiments were performed on natural convection heat transfer from circular pin fin heat sinks subject to the influence of its geometry, heat flux and orientation. The geometric dependence of heat dissipation from heat sinks of widely spaced solid and hollow/perforated circular pin fins with staggered combination, fitted into a heated base of fixed area is discussed. Over the tested range of Rayleigh...
A porous medium enhancement of convective heat transfer results from the passage of fluid through the open, interconnected void structure, exposing the fluid to large surface area. Many international papers are studied to verify the potential of porous carbon foam in thermal management systems. This was proved experimentally by comparing a bare copper pipe and copper pipe wrapped with porous carbon...
In this paper, a 3D thermal model that couples thermal and flow fields of a high-power, high-frequency oil-immersed transformer was presented. The thermal model including a set of conservation equations was solved using the finite volume method. The temperature and oil flow velocity distribution are of interest. Natural convection is the mechanism of heat dissipation. The results show that the conditions...
This study performs an experimental study concerning performance of an LED array under natural convection. A total of 270 1-W LEDs having an efficiency of 75% are used to simulate a large LED panel. The size of the cooling heat sink is 348 mm × 558 mm having vertical plate fin configuration with a fin spacing of 9.33 mm. The effect of shrouding, including shrouding above the heat sink and the blockages...
Natural convection air-cooling is the method of choice for many low power electronics applications due to cost, availability, and reliability. However, its performance is very limited due to buoyancy dependent flow. Therefore, there is a need for further enhancement of natural convection. Enhanced natural convection will allow higher heat dissipation and still largely maintains the simplicity of passive...
This paper investigates the effect of acoustic stimulation on natural convection heat transfer in micro-scale fin structures. Enhancement of heat transfer from electronic components enclosed within compact geometries is a key goal in thermal management. Among the techniques to enhance heat transfer, extended surface is a simple approach to achieve the goal. However, micro scale fin heat sinks have...
The study for the natural convective heat transfer from an inclined plate with the different angles submerged in air, with heated surface upward, is performed experimentally. The plate was heated with electric heating, the average surface temperature of plate was measured by the thermocouple embedded in back surface of plate, the electric heating current and voltage were measured. The comparison and...
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