3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe

Chernysheva, M.A.; Maydanik, Yury F.

doi:10.1016/j.applthermaleng.2011.09.025

Cited by 55 publications

(22 citation statements)

References 24 publications

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“…[3][4][5] to name but a few, and the works focussing on one of the components, the condenser or more often the evaporator because evaporator is generally considered as the key component in this system, e.g. [6,7]. The present work belongs to the second category.…”

Section: Introductionmentioning

confidence: 98%

Three dimensional liquid and vapour distribution in the wick of capillary evaporators

Mottet

Coquard

Prat

2015

International Journal of Heat and Mass Transfer

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a b s t r a c tHeat and mass transfer with liquid-vapour phase change in a representative unit cell of a capillary evaporator is studied using a mixed pore network model. The model combines the computation of temperature and pressure fields in vapour and liquid pores according to mean field approaches with pore scale invasion rules depending on the capillary pressure thresholds associated with each local constriction between two pores. The metallic body through which heat is transferred to the porous wick is also taken into account in the simulations. After comparisons with a visualisation experiment, numerical simulations performed in three dimensional pore networks lead to the identification of three main regimes depending on the applied heat load. Compared with previous works using the so-called vapour pocket assumption, the 3D simulations reveal a regime where the phase distribution within the wick is fundamentally different. This regime is characterised by the coexistence of both the liquid and vapour phases underneath the casing within the wick. This regime is shown to correspond to the best evaporator performance.

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Section: Introductionmentioning

confidence: 98%

Three dimensional liquid and vapour distribution in the wick of capillary evaporators

Mottet

Coquard

Prat

2015

International Journal of Heat and Mass Transfer

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“…For rectangular and flatoval evaporators, the compensation chamber is usually situated along the evaporator [62,63]. Both width or/and length of the compensation chamber can be altered to allow increased chamber volume when required [64].…”

Section: Loop Heat Pipe (Lhp)mentioning

confidence: 99%

Heat utilisation technologies: A critical review of heat pipes

Chan

Siqueiros

Ling‐Chin

et al. 2015

Renewable and Sustainable Energy Reviews

143

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“…In these studies, the liquid flow is assumed to be perpendicular to the heat flux at the wick wall, whereas in Li and Peterson (2011) the fluid and energy flows are counter current. The model in Chernysheva and Maydanik (2012) accounts for the dependence of the thermal properties on the temperature (but not on the pressure), whereas the other models mentioned so far assume constant thermal properties. Since these models are restricted to fully wet homogeneous and isotropic porous wicks, they are valid only in the low heat load regime.…”

Section: Introductionmentioning

confidence: 98%

“…Li and Peterson (2011) developed three-dimensional models for a square flat wick, which has a liquid reservoir at the top and a heating substrate at the bottom. Chernysheva and Maydanik (2012) as well as Zhang et al (2012) presented 3D models for capillary porous wicks with longitudinal replenishment. In these studies, the liquid flow is assumed to be perpendicular to the heat flux at the wick wall, whereas in Li and Peterson (2011) the fluid and energy flows are counter current.…”

Section: Introductionmentioning

confidence: 99%

Pore Network Simulations of Heat and Mass Transfer inside an Unsaturated Capillary Porous Wick in the Dry-out Regime

Kharaghani

Kirsch

et al. 2016

Transp Porous Med

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In this work, a two-dimensional pore network model is developed to study the heat and mass transfer inside a capillary porous wick with opposite replenishment in the dry-out regime. The mass flow rate in each throat of the pore network is computed according to the Hagen-Poiseuille law, and the heat flux is calculated based on Fourier's law with an effective local thermal conductivity. By coupling the heat and the mass transfer, a numerical method is devised to determine the evolution of the liquid-vapor interface. The model is verified by comparing the effective heat transfer coefficient versus heat load with experimental observations. For increasing heat load, an inflation/deflation of the vapor pocket is observed. The influences of microstructural properties on the vapor pocket pattern and on the effective heat transfer coefficient are discussed: A porous wick with a non-uniform or bimodal pore size distribution results in a larger heat transfer coefficient compared to a porous wick with a uniform pore size distribution. The heat and mass transfer efficiency of a porous wick comprised of two connected regions of small and large pores is also examined. The simulation results indicate that the introduction of a coarse layer with a suitable thickness strongly enhances the heat transfer coefficient. Area fraction of the vapor region H evp Evaporation latent heat (J/kg) L Throat length (m) M Mass flow rate (kg/s) n Outward unit normal vector p Pressure (Pa) Q Heat rate (W) q Heat load (W/m 2 ) r Throat radius (m) r 0 Mean throat radius (m) T Temperature ( • C) v Superficial velocity (m/s) v 0 Interstitial velocity (m/s) W Network thickness (m) Greek symbols α Heat transfer coefficient (W/m 2 K) ε Porosity ξ Parameter used in the stopping criterion of the algorithm (Sect. 3.5) λ Thermal conductivity (W/m K) μ Dynamic viscosity (Pa s) σ Surface tension (N/m) σ 0 Throat radius standard deviation (m) υ Kinematic viscosity (m 2 /s) ρ Liquid mass density (kg/m 3 )

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3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe

Cited by 55 publications

References 24 publications

Three dimensional liquid and vapour distribution in the wick of capillary evaporators

Three dimensional liquid and vapour distribution in the wick of capillary evaporators

Heat utilisation technologies: A critical review of heat pipes

Pore Network Simulations of Heat and Mass Transfer inside an Unsaturated Capillary Porous Wick in the Dry-out Regime

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