A numerical model for transient simulation of porous wicked heat pipes by lattice Boltzmann method

Huang, Yonghua; Chen, Qiang

doi:10.1016/j.ijheatmasstransfer.2016.09.085

Cited by 20 publications

(4 citation statements)

References 23 publications

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“…ℛ 1 and ℛ 2 are radii of curvature of the free surface in principal directions. The mass flow rate of the liquid, 𝑚 𝑙 ̇, along the heat pipe can be approximated to change linearly in evaporator and condenser regions considering the predictions of prior works (Odabasi, 2014;Chen et al, 2009;Rullière et al, 2007;Hung and Tio, 2012;Elnaggar et al, 2012;Huang and Chen, 2017), while the axial liquid flow rate remains approximately constant in the adiabatic region due to negligible phase change. To this effect, 𝑚 𝑙 ̇ can be expressed as a linear function of the axial coordinate, 𝑧, in the evaporator and condenser.…”

Section: Flow Modelmentioning

confidence: 99%

Fast and Predictive Heat Pipe Design and Analysis Toolbox: H-Pat

Saygan

Akkuş

Dursunkaya

et al. 2022

Isı Bilimi Ve Tekniği Dergisi

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For the assessment of the thermal performance of heat pipes, a wide range of modeling is available in the literature, ranging from simple capillary limit analyses to comprehensive 3D models. While simplistic models may result in less accurate predictions of heat transfer and operating temperatures, comprehensive models may be computationally expensive. In this study, a universal computational framework is developed for a fast but sufficiently accurate modeling of traditional heat pipes, and an analysis tool based on this framework, named Heat Pipe Analysis Toolbox, in short H-PAT is presented. As a diagnostic tool, H-PAT can predict the fluid flow and heat transfer from a heat pipe under varying heat inputs up to the onset of dryout. During the initial estimation of phase change rates, the solutions of particular thin film phase change models are avoided by specifying an appropriate pattern for the mass flow rate of the liquid along the heat pipe rather than using finite element/volume based methods for the computational domain. With the help of a modular structure, H-PAT can simulate heat pipes with different wick structures as long as an expression for the average liquid velocity and corresponding pressure drop can be introduced. H-PAT is also capable of analyzing heat pipes with variable cross-sections, favorable/unfavorable gravity conditions and utilizes temperature dependent thermo-physical properties at evaporator, condenser and adiabatic regions together with heat input sensitive vapor pressure. In addition, H-PAT performs the computation very fast which also makes it a perfect design tool for researchers and design engineers in the field of thermal management.

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Section: Flow Modelmentioning

confidence: 99%

Fast and Predictive Heat Pipe Design and Analysis Toolbox: H-Pat

Saygan

Akkuş

Dursunkaya

et al. 2022

Isı Bilimi Ve Tekniği Dergisi

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“…And 60 percent of three filling ratios, 70 percent, 80 percent of acetone is found to be the more appropriate 60 percent filling ratio is better for heat transfer features in this paper we are considering the multiphase fluid and filling ratio also so I am decided to taken the multi phase nanofluid is AL 2 O 3 and TIO 2 . Huang and Chen [4] The numerical model in this document will be assessed on the basis that the simulation performance of heat pipes is effective. The wick is modeled as a fully thawed porous medium in which the impacts of fluid flow and fluid non-flow are known.…”

Section: Nano Fluidmentioning

confidence: 99%

Experimental Investigation of Heat Pipe Heat Exchanger with Hybrid Nanofluids

2020

IJETER

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The heat pipe is a type of heat exchanger, which is widely used for thermal control because it has high possible heat transfer rate over a substantial distance with the low temperature drop. In this research work, the effect of heat exchange between hot and cold mass at different evaporator heat inputs on heat pipe heat exchanger efficiency and it is investigated for different inclination angles, heat inputs and adiabatic heat pipe lengths. Hybrid Nano-fluid, a mixture of 70 per cent of AL 2 O 3 and 30 per cent of TiO 2 Nano-fluidis used as working fluid with deionized water as the base fluid. The hot water mass flow rate (mh) of 0.2, 0.4, 0.6 and 0.8 litres per minute is used in the evaporator section. The cold-water mass flow rate (m c ) is maintained as 50% of m h throughout the experiment. The experimental tests are conducted for adiabatic lengths of 0 mm, 100 mm and 200 mm of Heat pipe oriented at inclination angles of 0°, 15°, 30°, and 45° at various heat inputs of 40, 60 and 80 W. The experimental findings showed that increasing adiabatic length reduces the heat pipe effectiveness. With increasing inclination angles for the whole hot water mass flow rate, the effectiveness of the heat pipe was increased. Compared to two other mass flow rates of 40 and 60 watts heat inputs at all the inclination angles, 0.2 and 0.4 ml water mass flow rate showed higher effectiveness. Whereas the heat input of 80 W had similar characteristics of efficiency except at angle of inclination of 45 °.

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“…The last one is conjugate natural convection in a fluid-saturated porous cavity with a hot triangular thick wall [3], which can demonstrate the simplicity and effectiveness of the present model for complicated conjugate interfaces. The choice of validation benchmark with simple configuration can avoid unexpected numerical errors which will hamper the assessment for a new numerical approach, so for all recent open work of developing new LB models for conjugate heat transfer simulation and porous media modelling [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], the test cases adopted for numerical validation are characterized by simple configuration. For conjugate natural convection, fluid flow should be modelled simultaneously.…”

Section: Numerical Validationmentioning

confidence: 99%

“…During the past three decades, the lattice Boltzmann (LB) method has attracted increasing attention due to its some intrinsic advantages, such as relatively easy treatment of complicated geometry, high parallel computing efficiency and capturing interaction between different phases at a mesoscopic level [21]. Until now, the LB method has been widely used to investigate heat and mass transfer in porous media [22][23][24][25]. Especially, as it is a particle-based numerical solver, the LB method can guarantee, automatically, the continuity of a certain macroscopic quantity and of its flux across an arbitrary interface within the investigated domain, if the macroscopic quantity and its flux can be recovered from the zeroth-and first-order moment of the corresponding pseudo-particle distribution function, respectively.…”

Section: Introductionmentioning

confidence: 99%

Simulation of conjugate heat transfer between fluid-saturated porous media and solid wall

Chen

2018

International Journal of Thermal Sciences

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Conjugate heat transfer between fluid-saturated porous media and solid walls is an important issue in many disciplines. For traditional numerical techniques, it is still a great challenge to treat conjugate problems, especially with complicated interfaces.In the present work, a new numerical approach, based on the lattice Boltzmann (LB) method, is proposed to address such challenge. In the present approach no explicit special treatment on coupled interfaces between fluid-saturated porous media and solid walls is required. Moreover, no additional source term, which exists in the available LB models, is required. It can guarantee that the simplicity, accuracy and stability of the present model are better than those models. The accuracy and re-

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A numerical model for transient simulation of porous wicked heat pipes by lattice Boltzmann method

Cited by 20 publications

References 23 publications

Fast and Predictive Heat Pipe Design and Analysis Toolbox: H-Pat

Fast and Predictive Heat Pipe Design and Analysis Toolbox: H-Pat

Experimental Investigation of Heat Pipe Heat Exchanger with Hybrid Nanofluids

Simulation of conjugate heat transfer between fluid-saturated porous media and solid wall

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