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Heat Pipe Science and Technology, An International Journal

Publicado 4 números por año

ISSN Imprimir: 2151-7975

ISSN En Línea: 2151-7991

THE EFFECT OF HEAT PIPE INTERNAL FLUID PROPERTIES ON ENHANCING HEAT TRANSFER UNDER FORCED CONVECTION FLOWS

Volumen 4, Edición 4, 2013, pp. 277-305
DOI: 10.1615/HeatPipeScieTech.2014010879
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SINOPSIS

A numerical and experimental study into the effect of heat pipe internal fluid properties on heat transfer through cooling a high-temperature convection airstream was carried out. Using pure water inside the heat pipe as the baseline working fluid, the influence of varying liquid density, thermal conductivity, dynamic viscosity, and specific heat capacity on convective heat transfer and Prandtl number was investigated. Numerical analysis for predicting air temperatures was carried out using computational fluid dynamics (CFD). The physical domain comprised 19 cylindrical heat pipes arranged in a staggered grid subjected to an inlet velocity and source temperature of 2.3 m/s and 314 K. The temperature profiles obtained from the CFD model using water as the working fluid were experimentally validated using wind tunnel testing. The results showed a pre-cooling potential of approximately 2 K or 1 kW under the forced convection flow. Good correlation was observed between the CFD and experimental techniques with a mean temperature drop variation of 0.6 K or 20%. The findings revealed that the specific heat capacity has the most significant impact on enhancing heat transfer through convection, as an increase of 39% was obtained when the specific heat capacity was increased from 1000 J/kgK to 6000 J/kgK. Conversely, the study showed that the least dominant parameter in augmenting heat transfer was the liquid dynamic viscosity, as an increase of 16% was calculated when varied between 10−5 Pa s and 10−1 Pa s. The work highlighted the operative range where convective heat transfer of air passing over the bank of heat pipes can be influenced by the internal fluid within the heat pipe.

CITADO POR
  1. Chaudhry Hassam Nasarullah, A study on optimising heat pipe geometrical parameters for sustainable passive cooling within the built environment, Applied Thermal Engineering, 2015. Crossref

  2. Calautit John Kaiser, Chaudhry Hassam Nasarullah, Hughes Ben Richard, Wind tunnel data of the analysis of heat pipe and wind catcher technology for the built environment, Data in Brief, 5, 2015. Crossref

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