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M. A. Hanlon

Bio: M. A. Hanlon is an academic researcher from University of Missouri. The author has contributed to research in topics: Heat pipe & Thermal conduction. The author has an hindex of 4, co-authored 4 publications receiving 279 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a two-dimensional model is presented to predict the overall heat transfer capability for a sintered wick structure, where the model considers the absence of bulk fluid at the top surface of the wick, heat conduction resistance, capillary limitation, and the onset of nucleate boiling.
Abstract: A two-dimensional model is presented to predict the overall heat transfer capability for a sintered wick structure. The model considers the absence of bulk fluid at the top surface of the wick, heat conduction resistance through the wick, capillary limitation, and the onset of nucleate boiling. The numerical results show that thin film evaporation occurring only at the top surface of a wick plays an important role in the enhancement of evaporating heat transfer and depends on the thin film evaporation, the particle size, the porosity, and the wick structure thickness. By decreasing the average particle radius, the evaporation heat transfer coefficient can be enhanced. Additionally, there exists an optimum characteristic thickness for maximum heat removal. The maximum superheat allowable for thin film evaporation at the top surface of a wick is presented to be a function of the particle radius, wick porosity, wick structure thickness, and effective thermal conductivity. In order to verify the theoretical analysis, an experimental system was established, and a comparison with the theoretical prediction conducted. Results of the investigation will assist in optimizing the heat transfer performance of sintered porous media in heat pipes and better understanding of thin film evaporation.

171 citations

Journal ArticleDOI
TL;DR: In this paper, a mathematical model for predicting the oscillating motion in a pulsating heat pipe is presented, which considers the thermal energy from the temperature difference between the evaporator and condenser as the driving force for the oscillation motion, which will overcome both the frictional force and the force due to the deformation of compressible bubbles.
Abstract: A mathematical model for predicting the oscillating motion in a pulsating heat pipe is presented. The model considers the thermal energy from the temperature difference between the evaporator and condenser as the driving force for the oscillating motion, which will overcome both the frictional force and the force due to the deformation of compressible bubbles. The results show that the oscillating motion depends on the temperature difference between the condensing section and evaporating section, the working fluid, the operating temperature, the dimensions, and the filled liquid ratio. The results of this investigation will assist in the development of miniature pulsating heat pipes capable of operating at increased power levels.

81 citations

Proceedings ArticleDOI
24 Jun 2002
TL;DR: In this article, a two-dimensional model is presented to predict the overall heat transfer capability for a sintered wick structure, where the model considers the absence of bulk fluid at the top surface of the wick, heat conduction resistance, capillary limitation, and the onset of nucleate boiling.
Abstract: A two-dimensional model is presented to predict the overall heat transfer capability for a sintered wick structure. The model considers the absence of bulk fluid at the top surface of the wick, heat conduction resistance through the wick, capillary limitation, and the onset of nucleate boiling. The numerical results show that thin film evaporation occurring only at the top surface of a wick plays an important role in the enhancement of evaporating heat transfer and depends on the thin film evaporation, the particle size, the porosity, and the wick structure thickness. By decreasing the average particle radius, the evaporation heat transfer coefficient can be enhanced. Additionally, there exists an optimum characteristic thickness for maximum heat removal. The maximum superheat allowable for thin film evaporation at the top surface of a wick is presented to be a function of the particle radius, wick porosity, wick structure thickness, and effective thermal conductivity. In order to verify the theoretical analysis, an experimental system was established, and a comparison with the theoretical prediction conducted. Results of the investigation will assist in optimizing the heat transfer performance of sintered porous media in heat pipes and better understanding of thin film evaporation.

43 citations


Cited by
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Journal ArticleDOI
TL;DR: Pulsating (or oscillating) heat pipes (PHP or OHP) are new two-phase heat transfer devices that rely on the oscillatory flow of liquid slug and vapor plug in a long miniature tube bent into many turns.
Abstract: Pulsating (or oscillating) heat pipes (PHP or OHP) are new two-phase heat transfer devices that rely on the oscillatory flow of liquid slug and vapor plug in a long miniature tube bent into many turns. The unique feature of PHPs, compared with conventional heat pipes, is that there is no wick structure to return the condensate to the heating section; thus, there is no countercurrent flow between the liquid and vapor. Significant experimental and theoretical efforts have been made related to PHPs in the last decade. While experimental studies have focused on either visualizing the flow pattern in PHPs or characterizing the heat transfer capability of PHPs, theoretical examinations attempt to analytically and numerically model the fluid dynamics and/or heat transfer associated with the oscillating two-phase flow. The existing experimental and theoretical research, including important features and parameters, is summarized in tabular form. Progresses in flow visualization, heat transfer characteristics, and ...

368 citations

Journal ArticleDOI
TL;DR: In this article, a review is presented concerning the types of heat pipes, heat pipe analysis, and simulations, as well as advances in computational and experimental methodologies for heat pipes.
Abstract: Over the last several decades, several factors have contributed to a major transformation in heat pipe science and technology applications The first major contribution was the development and advances of new heat pipes, such as loop heat pipes (LHPs), micro and miniature heat pipes, and pulsating heat pipes (PHPs) In addition, there are now many commercial applications that have helped contribute to the recent interest in heat pipes For example, several million heat pipes are manufactured each month for applications in CPU cooling and laptop computers Numerical modeling, analysis, and experimental simulation of heat pipes have significantly progressed due to a much greater understanding of various physical phenomena in heat pipes as well as advances in computational and experimental methodologies A review is presented hereafter concerning the types of heat pipes, heat pipe analysis, and simulations

334 citations

Journal ArticleDOI
TL;DR: By combining nanofluids with thermally excited oscillating motion in an oscillating heat pipe (OHP), Wang et al. as mentioned in this paper developed an ultrahighperformance cooling device, called the nanoffluid oscillating pipe.
Abstract: By combining nanofluids with thermally excited oscillating motion in an oscillating heat pipe (OHP), we developed an ultrahigh-performance cooling device, called the nanofluid oscillating heat pipe. Experimental results show that when the OHP is charged with nanofluid, heat transport capability significantly increases. For example, at the input power of 80.0W, diamond nanofluid can reduce the temperature difference between the evaporator and the condenser from 40.9to24.3°C. This study will accelerate the development of a highly efficient cooling device for ultrahigh-heat-flux electronic systems.

298 citations

Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: In this article, the authors measured the dependence of thermal resistance on the thickness and particle size of sintered copper powder wick surfaces, both under evaporation and boiling conditions, and demonstrated that for a given wick thickness, an optimum particle size exists which maximizes the boiling heat transfer coefficient.

251 citations