The heat pipe

Dunn, P.D.; Reay, David

doi:10.1088/0305-4624/4/3/i01

Cited by 34 publications

(17 citation statements)

References 1 publication

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“…However, the effective thermal conductivity of a heat pipe is very high, which results in a nearly isothermal temperature profile. In most cases, the effective thermal conductivity of the heat pipe is several orders of magnitude larger than the heat transfer coefficient between the condenser and the environment, and thus the Biot number criterion is satisfied [4], [5]. Several conditions are examined, and closed-form solutions are derived for a convective boundary, which describe the transient lumped temperature of the heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Solution to External and Internal Heat and Mass Transfer Problems for Closed Two-Phase Thermosyphon

Александров¹,

Akat’ev²,

Тюрин³

et al. 2017

HoBMSTU.SNS

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Section: Introductionmentioning

confidence: 99%

Solution to External and Internal Heat and Mass Transfer Problems for Closed Two-Phase Thermosyphon

Александров¹,

Akat’ev²,

Тюрин³

et al. 2017

HoBMSTU.SNS

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“…Heat pipes and vapor chambers are two-phase heat transport devices that offer a passive and compact means of transporting heat over long distances without a substantial drop in temperature [1,2]. A heat pipe consists of a sealed chamber containing a working fluid such as water which transports heat through phase change.…”

Section: Introductionmentioning

confidence: 99%

3D reconstruction and design of porous media from thin sections

Bodla

Garimella

Murthy

2014

International Journal of Heat and Mass Transfer

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Characterization and design of fluid-thermal transport through random porous sintered beds is critical for improving the performance of two-phase heat transport devices such as heat pipes. Two-dimensional imaging techniques are quite well developed and commonly employed for microstructure and material characterization. In this study, we employ 2D image data (thin sections) for measuring critical microstructural features of commercial wicks for use in correlation-based prediction of transport properties. We employ a stochastic characterization methodology based on the two-point autocorrelation function, and compare the predicted properties such as particle and pore diameters and permeability with those from our previously published studies, in which 3D x-ray microtomography data was employed for reconstruction. Further, we implement a reconstruction technique for reconstructing a three-dimensional stochastic equivalent structure from the thin sections. These reconstructed domains are employed for predicting effective thermal conductivity, permeability and interfacial heat transfer coefficient in singlephase flow. The current computations are found to compare well with models and correlations from the literature, as well as our previous numerical studies. Finally, we propose a new parametrized model for the design of porous materials based on the nature of the two-point autocorrelation functions. Using this model, we reconstruct sample three-dimensional microstructures, and analyze the influence of various parameters on fluid-thermal properties of interest. With advances in additive manufacturing techniques, such an approach may eventually be employed to design intricate porous structures with properties tailored to specific applications.

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“…Heat pipes, vapor chambers, and two-phase capillary pumped loop devices capable of transporting heat over long distances without a substantial drop in temperature offer passive and compact cooling alternatives to pumped cooling systems [5,6]. These devices exploit capillary action generated by an internal porous material lining that enables passive transport of the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Simulated Microstructural Evolution and Design of Porous Sintered Wicks

Bodla

Garimella

2014

Journal of Heat Transfer

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Porous structures formed by sintering of powders, which involves material-bonding under the application of heat, are commonly employed as capillary wicks in two-phase heat transport devices such as heat pipes. These sintered wicks are often fabricated in an ad hoc manner, and their microstructure is not optimized for fluid and thermal performance. Understanding the role of sintering kinetics-and the resulting microstructural evolution-on wick transport properties is important for fabrication of structures with optimal performance. A cellular automaton model is developed in this work for predicting microstructural evolution during sintering. The model, which determines mass transport during sintering based on curvature gradients in digital images, is first verified against benchmark cases, such as the evolution of a square shape into an areapreserving circle. The model is then employed to predict the sintering dynamics of a sideby-side, two-particle configuration conventionally used for the study of sintering. Results from previously published studies on sintering of cylindrical wires are used for validation. Randomly packed multiparticle configurations are then considered in two and three dimensions. Sintering kinetics are described by the relative change in overall surface area of the compact compared to the initial random packing. The effect of sintering parameters, particle size, and porosity on fundamental transport properties, viz., effective thermal conductivity and permeability, is analyzed. The effective thermal conductivity increases monotonically as either the sintering time or temperature is increased. Permeability is observed to increase with particle size and porosity. As sintering progresses, the slight increase observed in the permeability of the microstructure is attributed to a reduction in the surface area.

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The heat pipe

Cited by 34 publications

References 1 publication

Solution to External and Internal Heat and Mass Transfer Problems for Closed Two-Phase Thermosyphon

Solution to External and Internal Heat and Mass Transfer Problems for Closed Two-Phase Thermosyphon

3D reconstruction and design of porous media from thin sections

Simulated Microstructural Evolution and Design of Porous Sintered Wicks

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