Measurements of the transient behavior of a capillary structure under heavy thermal loading

Colwell, Gene T.; Chang, Won Soon

doi:10.1016/0017-9310(84)90027-9

Cited by 30 publications

(11 citation statements)

References 4 publications

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“…Similarly for the condenser region psA w \L c (8) (9) Implicit in Eqs. (8) and (9) is the assumption that the vaporization and condensation are uniform over the evaporator and condenser, respectively.…”

Section: Source Termmentioning

confidence: 98%

Detailed model for transient liquid flow in heat pipe wicks

Ambrose

Chow

Beam

1991

Journal of Thermophysics and Heat Transfer

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Transient liquid flow in a low-temperature, homogeneous wick heat pipe is investigated experimentally and analytically for pulsed heat load conditions. The continuous distribution of the liquid in the wick is modeled, where previous models had assumed a uniformly saturated structure. A heat pipe with beryllium walls was used to obtain transient measurements of the saturation distribution in the wick structure using x-ray radiography. Analytical and experimental results are presented for the axial liquid distribution in the wick as a function of time. Transient liquid distributions for the model and experiment compare favorably. These results show that significant reductions in saturation may occur in the evaporator region for higher heat loads. These reductions affect the wick-flow properties and must be included in the liquid-flow analysis. Nomenclature A -area, m 2 /(5) -moisture diffusivity, kg-m/s, Eq. (6) / = source term, s~l, Eq. (5) K = full permeability, m 2 K r -relative permeability L = length, m m = mass of liquid in pores, kg m -mass flow rate, kg/s P = pressure, Pa P c = capillary pressure, Pa Q = heat transfer rate, w S = saturation (ratio of liquid volume to void volume) 5, = irreducible saturation T = temperature, °C t -time, s x -position coordinate, m e = wick porosity A = latent heat of vaporization, J/kg IJL = dynamic viscosity of liquid, kg/m -s p = density of liquid, kg/m 3 a = surface tension, N/m = reduced saturation (<£ = S -5/1 -S,)

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Section: Source Termmentioning

confidence: 98%

Detailed model for transient liquid flow in heat pipe wicks

Ambrose

Chow

Beam

1991

Journal of Thermophysics and Heat Transfer

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“…Experimentally methods described by Ferrell and Alleavitch, Freggens [19], or Eninger [20] can show pores or structures of more complex geometries. In addition, limited information on the transient behavior of capillary structures is also available (Colwell and Chang) [21].…”

Section: Capillary Pressure At the Liquid-vapor Interfacementioning

confidence: 99%

Heat Pipe Theory and Modeling

Zohuri

2016

Heat Pipe Design and Technology

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In this chapter, we will discuss the theory of heat pipe with an approach that our readers have no knowledge of advanced mathematics, physics, and heat pipe. We cover the basic science and technology behind the heat pipe. Whenever we had to refer to basic knowledge of physics, fluid mechanics, and gas dynamics, Wiki site or very basic physics books to give the reader some general idea of specific topics of discussion in the particular section of this chapter along with heat pipe science were utilized. This section covers the fundamental theory behind the heat pipe based on different research papers and books available at present time in order to open a clear path for reader to design and fabricate their required heat pipe within their applications.

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“…The rig may also be used to carry out the processes such as working fluid degassing, working fluid metering, heat pipe degassing, and heat pipe filling with inert gas (Figure 6b) [48]. The material of construction for pipe-work is generally either glass or stainless steel.…”

Section: Filling Rigmentioning

confidence: 99%

A Review of Concentric Annular Heat Pipes

Nouri-Borujerdi

Layeghi

2005

Heat Transfer Engineering

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A detailed description of a concentric annular heat pipe (CAHP) operation is presented in low to moderate temperature ranges • C). The steady-state response of a CAHP to various heat fluxes in the evaporator and condenser sections are discussed. Two-dimensional mathematical modeling of the fluid flow and heat transfer in the annular vapor space and the wicks are described. The fundamental aspects and limitations of the operation of a CAHP are also discussed. Previously used numerical and experimental approaches for the analysis of the CAHPs and some related concepts are reviewed. The Navier-Stokes and similar equations are recommended for the simulation of fluid flow and heat transfer in the annular vapor space and the wicks. A number of important concepts, such as two-phase flow, heat transfer in the heat pipe wicks, the vapor-liquid interface conditions, design considerations, testing, and manufacture of a CAHP, are also briefly discussed. The results of this research have shown that the available numerical and experimental data in the literature are sufficiently accurate in many applications. However, new mathematical models and experimental works are needed for the better design and manufacture of various types of CAHPs.

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Measurements of the transient behavior of a capillary structure under heavy thermal loading

Cited by 30 publications

References 4 publications

Detailed model for transient liquid flow in heat pipe wicks

Detailed model for transient liquid flow in heat pipe wicks

Heat Pipe Theory and Modeling

A Review of Concentric Annular Heat Pipes

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