Surface Wetting Through Capillary Grooves

Bressler, R. G.; Wyatt, P.W.

doi:10.1115/1.3449605

Cited by 23 publications

(5 citation statements)

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“…slightly above the saturation temperature T. such that no boiling occurs. This problem has been studied by Bressler and Wyatt (1970), Wayner et al (1976), Wayner (1978), Holm and Goplen (1979), Cook et al (1981), , , Mirzamoghadam and Catton (1988), and . We begin by examining the heat transfer rate in the transition region (figure 11.2) and we include the capillary meniscus and liquid motion.…”

Section: Evaporation From Heated Liquid Filmmentioning

confidence: 99%

Principles of Heat Transfer in Porous Media

Kaviany

1991

Mechanical Engineering Series

824

752

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except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use of general descriptive names, trade names, trademarks, etc., in this publication, even if the former are not especially identified, is not to be taken as a sign that such names, as understood by the Trade Marks and Merchandise Marks Act, may accordingly be used freely by anyone.Camera-ready copy prepared from the author's LaTeX file. 987654321 To my parents Farideh and Morad Series PrefaceMechanical engineering, an engineering discipline born of the needs of the industrial revolution, is once again asked to do its substantial share in the call for in dust rial renewal. The general call is urgent as we face profound issues of productivity and competitiveness that require engineering solutions, among others. The Mechanical Engineering Series is a new series, featuring graduate texts and research monographs, intended to address the need for information in contemporary areas of mechanical engineering.The series is conceived as a comprehensive one that will cover a broad range of concentrations important to mechanical engineering graduate education and research. We are fortunate to have a distinguished roster of consulting editors, each an expert in one of the areas of concentration. The names of the consulting editors are listed on the first page of the volume. PrefaceThis monograph aims at providing, through integration of available theoretical and empirical treatments, the differential conservation equations and the associated constitutive equations required for the analysis of transport in porous media. Although the empirical treatment of fluid flow and heat transfer in porous media is over a century old, only in the last three decades has the transport in these heterogeneous systems been addressed in sufficient detail. So far, single-phase flow and heat transfer in porous media have been treated or at least formulated satisfactorily. But the subject of two-phase flow and the related he at transfer in porous media is still in its infancy. This monograph identifies the pr in ci pIes of transport in porous media, reviews the available rigorous treatments, and whenever possible compares the available predictions, based on these theoretical treatments of various transport mechanisms, with the existing experimental results. The theoretical treatment is based on the local volume-averaging of the momentum and energy equations with the closure conditions necessary for obtaining solutions. While emphasizing abasie understanding of heat transfer in porous media, the monograph does not ignore the need for the predictive tools. Therefore, whenever a rigorous theoretical treatment of a phenomenon is not available, semiempirical and empirical treatments are given.The monograph is divided into two parts: part 1 deals with single-phase flows and part 2...

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Section: Evaporation From Heated Liquid Filmmentioning

confidence: 99%

Principles of Heat Transfer in Porous Media

Kaviany

1991

Mechanical Engineering Series

824

752

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“…3(c))is proposed, in which the copper powders be arrayed in cubic structure in radical direction and rhombohedral structure in axial direction, that is, an array model just between the cubic and rhombohedral patterns. As capillary structure can only form a limited capillary pressure head for cycles, the maximum quantity of heat transfer is restricted in micro heat pipes, and this restriction is also called mobilization force limit [16][17][18][19] .In most cases, the vapor generally flows in laminar and incompressible state. Therefore the mathematical formula deduced by Chi [20] for vapor flow in incompressible state of laminar flow on the assumption that heat load is uniformly distributed in evaporator and condenser can be adopted for the mathematical modeling for capillary limit, that is,…”

Section: Working Principlementioning

confidence: 99%

“…Application of Diamond and Related Materials F l is acquired after pressure loss of fluid flow in wicks and different flow passages [16][17][18][19] being considered, that is,…”

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confidence: 99%

A Mathematical Modeling Method for Capillary Limit of Micro Heat Pipe with Sintered Wick

Yang

et al. 2011

SSP

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With heat flux increasing and cooling space decreasing in microelectronic and chemical products, micro heat pipe has become an ideal heat dissipation device in high heat-flux products. Through the analysis of its working principle, the factors that affect its heat transfer limits and the patterns in which copper powders are arrayed in circular cavity, this paper first established a mathematical model for the crucial factors in affecting heat transfer limits in a circular micro heat pipe with a sintered wick, i.e. a theoretical model for capillary limit, and then verified its validity through experimental investigations. The study lays a powerful theoretical foundation for designing and manufacturing circular micro heat pipes with sintered wicks.

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“…19 For porous wick, r c can be approximated by the effective pore radius of the wick. 18 For the case of grooves heat pipes, r c is given by the following equation 19…”

Section: (4)mentioning

confidence: 99%

Design Parameter for Assessing Wicking Capabilities of Heat Pipes

Yip

1976

Journal of Spacecraft and Rockets

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The increasing use of heat pipes as efficient thermal power-transfer devices for the thermal control of highpower communication satellites suggests that there is a need for some parametric index to compare the thermal characteristics of different heat pipe structures. It is shown that the maximum heat-transfer rate sustainable by a heat pipe with a given working fluid is proportional to a wick parameter N w , which is a function of the wick geometry and structural design alone. Expressions for N w are derived and numerical values are tabulated for various wick structures used in heat pipe applications. Validity of this parameter is confirmed by comparison with over 70 measurements gathered from various sources. It is also shown that N w may be evaluated for heat pipes with composite wick structures, and an example is given. Nomenclature A ( = cross-sectional ara of liquid-flow channel b = width of grooves Dg = equivalent hydraulic diameter D p = particle diameter g = gravitational constant h^ = latent heat of evaporation ij = summation indices K p = wick permeability i = length £ m = effective transport length l t = total heat pipe length £ w = width of wick, or nominal inside circumference of heat pipe M = number of wick sections N = number of wick layers 'N g = liquid parameter [ Eq. (11) ] N w = wick parameter (Fig. 3) AP G = gravitational pressure force APg = pressure drop in liquid phase AP 5 = capillary pumping pressure Q = heat-transfer rate r c = equivalent minimum meniscus radius t w = wick thickness a p = groove pitch ratio, pitch/£ a w = groove depth ratix), t w jb e = porosity Pi = liquid viscosity pg -liquid density or = surf ace tension 0 = angle of inclinatsion .6 = contact angle \l/ = gravity factor [ Eq. (9) ] Subscripts a = adiabatic section c = condenser end e = evaporator end ij = indices max = maximum value

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Surface Wetting Through Capillary Grooves

Cited by 23 publications

References 0 publications

Principles of Heat Transfer in Porous Media

Principles of Heat Transfer in Porous Media

A Mathematical Modeling Method for Capillary Limit of Micro Heat Pipe with Sintered Wick

Design Parameter for Assessing Wicking Capabilities of Heat Pipes

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