Journal ArticleDOI
Effective thermal conductivity of heat pipes
A. Abo El-Nasr,S. M. El-Haggar +1 more
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In this paper, the effect of the number of wick layers on the effective thermal conductivity and the heat transfer characteristics of the heat pipes have been investigated, and it was found that the flow behavior of the working fluid depends on the wicking structures and number of Wicks layers.Abstract:
Several heat pipes were designed and manufactured to study the effect of the working fluids, container materials, and the wick structures on the heat transfer mechanism of the heat pipes. Also, the effect of the number of wick layers on the effective thermal conductivity and the heat transfer characteristics of the heat pipes have been investigated. It was found that the flow behavior of the working fluid depends on the wicking structures and the number of wick layers. The heat transfer characteristics and the effective thermal conductivity are related directly to the flow behavior. Increasing the number of wick layers (up to 16 layers) increases the heat flux with smaller temperature differences. The flattening phenomena of the thermal resistance was observed after 16 wicks layers due to the entrainment limit.read more
Citations
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A critical review of traditional and emerging techniques and fluids for electronics cooling
TL;DR: In this paper, a critical review of traditional and emerging cooling methods as well as coolants for electronics is provided, summarizing traditional coolants, heat transfer properties and performances of potential new coolants such as nanofluids are also reviewed and analyzed.
Journal ArticleDOI
Numerical study of finned heat pipe-assisted thermal energy storage system with high temperature phase change material
TL;DR: In this paper, the thermal characteristics of a finned heat pipe-assisted latent heat thermal energy storage system are investigated numerically using a transient two-dimensional finite volume based model employing enthalpy-porosity technique.
Journal ArticleDOI
Analysis of the Wicking and Thin-Film Evaporation Characteristics of Microstructures
TL;DR: In this paper, the free-surface shapes of the static liquid meniscus in common microstructures are modeled using SURFACE EVOLVER for zero Bond number, and four well-defined topologies, viz., surfaces with parallel rectangular ribs, horizontal parallel cylinders, vertically aligned cylinders, and spheres (the latter two in both square and hexagonal packing arrangements), are considered.
Journal ArticleDOI
Three-dimensional simulation of high temperature latent heat thermal energy storage system assisted by finned heat pipes
Saeed Tiari,Songgang Qiu +1 more
TL;DR: In this paper, a transient three-dimensional finite volume based model was developed to simulate the charging process of phase change material with different configuration of embedded heat pipes, and the melting of the phase change materials was modeled by employing enthalpy-porosity technique.
Journal ArticleDOI
Ohmic-assisted hydrodistillation technology: A review
Mohsen Gavahian,Asgar Farahnaky +1 more
TL;DR: Advantages of OAHD over conventional distillation include high thermal efficiency, short processing time and reduced operational cost, and further research on safety and sustainability along with economic study are prerequisites for commercial application of this technology.
References
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Theory of Heat Pipes
TL;DR: In this paper, a quantitative engineering theory for the design and performance analysis of heat pipes is given, where a heat pipe is a self-contained structure which achieves very high thermal conductance by means of two-phase fluid flow with capillary circulation.
Journal ArticleDOI
Analysis of flow and heat transfer characteristics of an asymmetrical flat plate heat pipe
Kambiz Vafai,W. Wang +1 more
TL;DR: In this article, an in-depth integral analysis revealing various physical aspects of an asymmetrical flat plate heat pipe is presented, where the resulting psuedo-three-dimensional vapor phase flow field is bifurcated on the x − y plane due to the asymmetrical nature of the heat source and sinks.
Physical principles of heat pipes
TL;DR: In this article, the physical principles of operation of heat pipes and choice of working fluid related to temperature range are discussed, and performance is limited by capillary pumping action in the wick together with impedance to liquid and vapor flow between the evaporator and condenser, sonic conditions, entrainment, evaporation and condensation rates.
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The physical principles of heat pipes
TL;DR: In this paper, the physical principles of operation of heat pipes and choice of working fluid related to temperature range are discussed, and performance is limited by capillary pumping action in the wick together with impedance to liquid and vapor flow between the evaporator and condenser, sonic conditions, entrainment, evaporation and condensation rates.
Journal ArticleDOI
Ultimate heat-pipe performance
TL;DR: In this paper, the ultimate heat transfer limitations imposed by sonic vapor flow were determined in heat pipes for sodium, potassium, and cesium working fluids, and reasonable agreement was found between the experimental results and existing theory.