Showing papers on "Heat pipe published in 2014"
20 Apr 2014
TL;DR: A detailed overview of heat pipes is presented in this paper, including a historical perspective, principles of operations, types of heat pipe, heat pipe performance characteristics, heatpipe limitations, heat pipeline frozen startup and shutdown, heat manifold analysis and simulations, and various applications of heat manifolds.
Abstract: A detailed overview of heat pipes is presented in this paper, including a historical perspective, principles of operations, types of heat pipes, heat pipe performance characteristics, heat pipe limitations, heat pipe frozen startup and shutdown, heat pipe analysis and simulations, and various applications of heat pipes. Over the last several decades, several factors have contributed to a major transformation in heat pipe science and technology . The first major contribution was the development and advances of new heat pipes, such as loop heat pipes, micro and miniature heat pipes, and pulsating heat pipes. In addition, there are now many new commercial applications that have helped contribute to the recent interest in heat pipes, especially related to the fields of electronic cooling and energy. For example, several million heat pipes are now manufactured each month since all modern laptops use heat pipes for CPU cooling. Numerical modeling, analysis, and experimental simulation of heat pipes have also significantly progressed due to a much greater understanding of various physical phenomena in heat pipes, as well as advances in computational and experimental methodologies.
273 citations
TL;DR: In this article, the use of flat heat pipe as an effective and low-energy device to mitigate the temperature of a battery module designed for a HEV application was investigated, and the nominal heat flux generated by the battery module was reproduced and applied to a flat heatpipe cooling system.
207 citations
TL;DR: In this article, a simplified one-dimensional transient computational model of a prismatic lithium-ion battery cell is developed using thermal circuit approach in conjunction with the thermal model of the heat pipe.
198 citations
TL;DR: In this paper, an analytical review of development, results of tests and simulation of loop heat pipes with disk-shaped, rectangular and flat-oval evaporators is presented, which may be arbitrarily separated into evaporators with opposite replenishment (EORs) and evaporators of longitudinal replenishment.
150 citations
TL;DR: In this article, the authors explored the use of heat pipe as cooling device for a specific HEV lithium-ion battery module, where the evaporator blocks of the heat pipe modules were fixed to a copper plate which played the role of the battery cooling wall.
132 citations
TL;DR: In this paper, a closed loop Pulsating Heat Pipe (CLPHP) with four transparent glass tubes forming the adiabatic section and connected with copper U-turns in the evaporator and condenser sections is designed in order to perform comprehensive thermal-hydraulic performance investigation.
120 citations
TL;DR: In this paper, a review is performed in order to clarify effect of nanorefrigerant properties (such as nanoparticle type, size and concentration) on heat transfer and pressure drop compared to pure refrigerant.
Abstract: The heat transfer performance of various thermal devices may be augmented by active and passive techniques. One of the passive techniques is the addition of ultrafine particles (called nanoparticles) to the common heat transfer fluids so that the thermal transport properties of the prepared suspension (called nanofluid) will be enhanced as compared to the base fluid. Nanorefrigerants are a special type of nanofluids which are mixtures of nanoparticles and refrigerants and have a broad range of applications in diverse fields for instance refrigeration, air conditioning systems, and heat pumps. In this paper, a review is performed in order to clarify effect of nanorefrigerant properties (such as nanoparticle type, size and concentration) on heat transfer and pressure drop compared to pure refrigerant. Moreover, studies related to the thermophysical properties, flow and pool boiling, and applications of nanorefrigerants to some specific areas such as domestic refrigerators, heat pipes and air conditioners are also summarized.
115 citations
TL;DR: In this article, the effect of nanofluid on the thermal performance of heat pipes is investigated experimentally and the wall temperature distribution and the thermal resistance between evaporation and condensation section are measured and compared with those for the heat pipes using distilled water.
105 citations
TL;DR: In this paper, an energy harvesting system which extracts heat from an automotive exhaust pipe and turns the heat into electricity by using thermoelectric power generators (TEGs) was built.
105 citations
TL;DR: In this paper, a multi-turn closed loop Pulsating heat pipe (CLPHP) made of copper (I.D. 1.1mm, O.D 2.2mm), filled with FC-72 is experimentally investigated.
102 citations
TL;DR: In this article, a photovoltaic/thermal (PV/T) hybrid system is proposed by selecting heat pipe (thermosyphon type) to absorb isothermally the excessive heat from solar PV cells.
TL;DR: In this article, the thermal performance of a wickless thermosyphon heat pipe charged with a biologically-produced ecofriendly working fluid is experimentally studied and the results showed that using the nanoparticles leads to the reduction in temperature distribution and enhances thermal performance.
TL;DR: In this paper, the authors presented the theoretical analysis and experimental validation on the transient behaviour of a proposed combined solar water heating and thermoelectric power generation system, which consists of concentrated solar thermal device that provides a high heat flux source for thermodelectric generators.
TL;DR: In this paper, the authors discussed the heat transfer enhancement of micro oscillating heat pipes (MOHPs) using self-rewetting fluid (SRWF), and analyzed the thermo-physical properties of SRWFs and deionized water.
TL;DR: In this article, the authors investigated natural ventilation streams typically found in domestic buildings and used heat pipe technology to recover the energy from them, using pure water as a natural phase change material to investigate the overall effectiveness of the heat pipe heat exchanger.
TL;DR: In this article, the authors investigated the thermal performance and thermal efficiency of a thermosyphon heat pipe charged with Al2O3-water/ethyleneglycol, (water-EG) and Al 2O3 -water/diethylenedlycol (water -DEG) nanofluids.
TL;DR: In this article, a self-lubricating and self-cooling tool was proposed by combining the pulsating heat pipe and surface texturing technologies, which reduced the cutting forces, cutting temperature, friction coefficient at the tool-chip interface, and tool wear.
Abstract: The concept of self-lubricating and self-cooling tools is proposed by combining the pulsating heat pipe and surface texturing technologies. The laser beam machining and electrical discharge machining are used to prepare the micro-texture self-lubricating and pulsating heat pipe self-cooling tools. The machining performance of the prepared tools and conventional tool in dry cutting of Ti-6Al-4V alloy is assessed in terms of cutting forces, cutting temperature, chip morphology and tool wear. Results show that the cutting forces, cutting temperature, friction coefficient at the tool–chip interface, and the tool wear of the micro-texture self-lubricating and pulsating heat pipe self-cooling tool are reduced compared with that of the conventional one. Coiling chips are produced with the micro-texture self-lubricating and pulsating heat pipe self-cooling tool while long and continuous chips are formed with the conventional tool. Two mechanisms responsible are found, first of all, the advanced tool's textured grooves were filled with solid lubricants which may be released and smeared at the tool–chip interface in cutting process; on the other hand, the pulsating heat pipe embedded in the tool could accelerate heat dissipation of the cutting insert.
TL;DR: In this article, the authors investigated the oscillation characteristics and the heat transfer performance of a closed-loop pulsating heat pipe (PHP) with deionized water, methanol, ethanol and acetone.
TL;DR: In this paper, the authors present an overview of literature dealing with recent developments in the study of heat transfer using nanofluids in heat pipes and some important inferences from the various papers are also highlighted.
TL;DR: In this paper, the performance of closed-loop pulsating heat pipes (CLPHPs) with an ID of 2.4 mm was examined. And the effect of uniform and alternating tube diameter on the performance was investigated.
TL;DR: In this paper, the effect of nanofluids on the closed loop pulsating heat pipe (CLPHP) performance using copper and silver colloidal nanophluids is described.
TL;DR: In this article, a modified desalination system is presented which uses advantages of thermosyphon heat pipes as a fast and high performance thermal conducting device, and at the same time, employs the advantages of evacuated tube collectors (ETCs).
TL;DR: In this paper, a closed loop Pulsating Heat Pipe made of a copper tube bent into a 2-D serpentine of 32 parallel channels and filled with FC-72 was tested on ground and in micro/hyper gravity conditions during the 58th ESA Parabolic Flight Campaign.
TL;DR: In this article, a heat pipe-metal foil approach is proposed to reduce the thermal resistances between a working fluid and the phase change material (PCM) solid-liquid interface, which leads to increased phase change rates relative to configurations involving only the heat pipe, or only a solid rod of the same physical dimensions as the pipe.
TL;DR: In this article, the effect of heat input, tilt angle and weight fractions of nanoparticles on the heat pipe thermal resistance, heat transfer coefficient in evaporator and condenser sections, thermal conductivity and thermal efficiency are investigated.
TL;DR: In this article, a closed-loop pulsating heat pipe (PHP) with four types of working fluids, deionized water, methanol, ethanol and acetone, was investigated.
TL;DR: In this article, an experimental investigation has been carried out to compare the enhancement in the thermal performance of sintered and mesh wick heat pipes by varying the working fluid, inclination angle and heat input.
TL;DR: In this paper, a numerical and experimental investigation was conducted on the thermal performance of latent heat thermal energy storage (LHTES) systems which use heat pipes (HPs) for solar thermal power generation.
TL;DR: In this paper, a closed loop Pulsating Heat Pipe (PHP) with nonintrusive spatial and temporal measurement of tube wall temperature by high-resolution infra-red thermography (IRT) has been attempted.
TL;DR: In this article, the effects of liquid filling ratios and leakage on the cooling performance of flat plate heat pipes (FPHPs) were examined experimentally in a study with the size of 150mm-×-50mm-2.5mm for all Al 6061 FPHPs filled with acetone.