Investigation of heat and mass transfer in the evaporation zone of a heat pipe operating by the ‘inverted meniscus’ principle

Демидов, А. В.; Yatsenko, E. S.

doi:10.1016/0017-9310(94)90317-4

Cited by 86 publications

(63 citation statements)

References 1 publication

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“…It was indicated that no macroscopic vapor zone was visually observed at low (or moderate) heat fluxes. Demidov and Yatsenko [12], Figus et al [13], and Takahashi et al [14] developed two-dimensional steady mathematical models and investigated numerically capillary-driven flow and heat transfer in rectangular porous media, where the study of [12] was in the case of a constant temperature on the top heated boundary with convection and the studies of [13,14] were in the cases of a constant heat flux on the top heated boundary without convection.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer with flow and evaporation in loop heat pipe’s wick at low or moderate heat fluxes

Ren

2007

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Heat transfer with flow and evaporation in loop heat pipe’s wick at low or moderate heat fluxes

Ren

2007

International Journal of Heat and Mass Transfer

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“…They also conclude that reasonably accurate results can be obtained by a twodimensional model especially when the vapor velocities are small for certain working fluids such as Freon-11 and ammonia. Unlike Cao and Faghri (1994a,b), Demidov and Yatsenko (1994) presented a numerical study showing that vapor zones can take place within the porous wick in the evaporator under the fins. A similar problem has also been studied by Figus et al (1999).…”

Section: Introductionmentioning

confidence: 88%

“…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%

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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“…With these two assumptions, only the liquid flow in the porous media is necessary to be studied and the capillary pressure at the liquid-vapor interface was neglected. At the same year, Demidov and Yatsenko [11] presented a numerical study showing that vapor zones can take place within the wick in the capillary evaporator under the fins. Figus et al [12] have also presented a numerical solution for heat and mass transfer in the cylindrical evaporator wick by using Darcy model and by using a two-dimensional pore net- [13] provided a numerical study on the flow and heat transfer in the wick structure of evaporator for a CPL based on two-phase mixture model.…”

Section: Introductionmentioning

confidence: 98%

Heat transfer with flow and phase change in an evaporator of miniature flat plate capillary pumped loop

et al. 2007

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An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop (CPL) evaporator is developed to describe the liquid and vapor flow, heat transfer and phase change in the porous wick structure, liquid flow and heat transfer in the compensation cavity and heat transfer in the vapor grooves and metallic wall.The entire evaporator is solved with SIMPLE algorithm as a conjugate problem. The effect of heat conduction of metallic side wall on the performance of miniature flat plate CPL evaporator is analyzed, and side wall effect heat transfer limit is introduced to estimate the performance of evaporator. The shape and location of vapor-liquid interface inside the wick are calculated and the influences of applied heat flux, liquid subcooling, wick material and metallic wall material on the evaporator performance are investigated in detail. The numerical results obtained are useful for the miniature flat plate evaporator performance optimization and design of CPL.Keywords: capillary pumped loop, flat plate evaporator, side wall effect heat transfer limit, wick structure

show abstract

Investigation of heat and mass transfer in the evaporation zone of a heat pipe operating by the ‘inverted meniscus’ principle

Cited by 86 publications

References 1 publication

Heat transfer with flow and evaporation in loop heat pipe’s wick at low or moderate heat fluxes

Heat transfer with flow and evaporation in loop heat pipe’s wick at low or moderate heat fluxes

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

Heat transfer with flow and phase change in an evaporator of miniature flat plate capillary pumped loop

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