Heat transfer in the inverted meniscus type evaporator at high heat fluxes

Khrustalev, Dmitry; Faghri, Amir

doi:10.1016/0017-9310(95)00003-r

Cited by 73 publications

(57 citation statements)

References 5 publications

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“…Ren and Wu [16] modeled the effect of wick effective thermal conductivity in LHP evaporators; a two-dimensional axisymmetric model was developed yielding results in agreement with the literature in some respects, namely the position of the liquid front in relation to a heated fin [17,18].…”

Section: Loop Heat Pipesupporting

confidence: 51%

Porous Structures in Heat Pipes

Němec¹

2018

Porosity - Process, Technologies and Applications

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This work deals with heat pipes with porous wick structures and experiments depending on the wick structure porosity, because the porosity is one of the wick structure properties which has effect on the heat transport ability of the heat pipe. The work describes manufacturing porous wick structures for wick heat pipe by sintering of copper metal powders with various powder grain size; manufacturing porous wick structures for loop heat pipe by sintering of copper and nickel metal powders with various powder grain size; influence of manufacturing technology on the wick structure porosity by microscopic analysis of the porous structure; design and construction of wick heat pipe and loop heat pipes; experimental determination influence of the wick structure porosity on the heat transport ability of loop heat pipes at various conditions; and experimental and mathematical determination influence of the wick structure porosity on the heat transport ability of wick heat pipes at various conditions.

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Section: Loop Heat Pipesupporting

confidence: 51%

Porous Structures in Heat Pipes

Němec¹

2018

Porosity - Process, Technologies and Applications

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“…The computational domain mentioned above is mostly not a complete evaporator, and it leads to some shortages in evaluating the overall evaporator performance by these models. Secondly, the previous works in literatures mainly stayed at the simulation or experiments of steady heat transfer in the porous wick (Khrustalev and Faghri 1995;Zhao and Liao 2000;Demidov and Yatsenko 1994;Figus et al 1999), which cannot simulate the development of flow and energy field in the evaporator from startup to a steady working state or the response of flow and energy field on the change of the working conditions, such as the suddenly change of the heat load. Thirdly, the previous literatures are mainly proposed based on the continuous governing equations (Navier-Stokes equation) at the representative elementary volume (REV) scale.…”

Section: Introductionmentioning

confidence: 99%

“…Thirdly, the previous literatures are mainly proposed based on the continuous governing equations (Navier-Stokes equation) at the representative elementary volume (REV) scale. Thus, these models need two basic assumptions (Wan et al 2009;Figus et al 1999;Khrustalev and Faghri 1995): (1) continuous assumption, (2) thermodynamic equilibrium between solid phase and liquid phase. Actually, there are temperature differences between solid and liquid phase in the porous wick.…”

Section: Introductionmentioning

confidence: 99%

“…1, and for the security and efficiency of a CPL performance, it is important and necessary to investigate the dynamic and thermodynamic behavior of the working fluid in the evaporator. Khrustalev and Faghri (1995) developed a one-dimensional mathematical model on the basis of heat transfer with thin-film evaporation theory in a pore and heat transfer in the dry porous media and close-touched heated fins, and the analytical steady solution was derived. Zhao and Liao (2000) investigated experimentally heat transfer in glass-bead-packed cubic porous media with a groovy heated wall on the top at different heated fluxes, and the onedimensional approximated solutions derived from this paper agreed with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Heat and Mass Transfer in a Evaporator of a Capillary-Pumped Loop with the Lattice Boltzmann Method: Pore Scale Simulation

Xuan

Zhao

2011

Transp Porous Med

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A two-dimensional transient numerical model based on the lattice Boltzmann method (LBM) for the global evaporator of a capillary-pumped loop (CPL) is proposed to describe heat and mass transfer with evaporation in the porous wick, heat conduction in the cover plate, and heat transfer in the vapor groove. To indicate the stochastic phase distribution characteristics of most porous wick, the quartet structure generation set (QSGS) is introduced for generating more realistic microstructures of porous media. By using the present lattice Boltzmann algorithm along with the porous structure, the heat and mass transfer of an evaporator on pore scale can be predicted without resorting to any empirical parameters determined case by case. The energy equations for entire evaporator are solved as a conjugate problem, which are solved by means of a spatially varying relaxation time in the lattice Boltzmann model and the liquid flow is driven via the interfacial mass flux. A convective boundary condition considering the latent heat during the evaporation on the interface is introduced into the lattice Boltzmann model based on the nonequilibrium extrapolation rule. Especially, the bounce-back rule and the equilibrium rule of the LBM are, respectively, introduced to deal with the momentum boundary conditions inside the porous wick and on the evaporation interface in order to ensure the stability and the efficiency of the LBM model. Numerical results corresponding to different working conditions and different working fluids are presented, which provide guidance for the evaporator design of a CPL system.

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“…Although over the last several decades, various computational methods have been used in this field [3][4][5][6] , two shortcomings exist in current researches. Firstly, most previous numerical simulations were carried out based on the discretizations of certain semiempirical models using some standard conventional techniques, such as the finite-difference, finite-volume, and finite-element methods at the representative elementary volume (REV) scale, without considering the microstructures of the porous media which are very important to energy transport in the mircoporous media [7,8] . Secondly, some thermal parameters, such as thermal conductivity for such a complex structure used in the traditional CFD were obtained from some semiempirical equations.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the three-dimensional multiphase conjugate conduction problem inside porous wick with the lattice Boltzmann method

Zhao

Xuan

2009

Sci. China Ser. E-Technol. Sci.

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Citation: Zhao K, Li Q, Xuan Y M. Investigation on the three-dimensional multiphase conjugate conduction problem inside porous wick with the lattice Boltzmann method. A lattice Boltzmann model is developed for investigating the heat conduction process inside the three-dimensional random porous media. Combined with the algorithm for the reconstruction of the three-dimensional porous media, this model is used to investigate the transient heat conduction process inside the porous wick of CPLs/LHPs, which is vital for analyzing the startup stability of a CPL/LHP. The temperature distribution inside the porous wick is obtained and the influence of the porosity and the heat load on the conduction process also is investigated using the present model. The present model is applicable to predicting the effective conductivity of such a complex structure.porous media, lattice Boltzmann method, pore scale, effective conductivity

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Heat transfer in the inverted meniscus type evaporator at high heat fluxes

Cited by 73 publications

References 5 publications

Porous Structures in Heat Pipes

Porous Structures in Heat Pipes

Investigation on Heat and Mass Transfer in a Evaporator of a Capillary-Pumped Loop with the Lattice Boltzmann Method: Pore Scale Simulation

Investigation on the three-dimensional multiphase conjugate conduction problem inside porous wick with the lattice Boltzmann method

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