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Guo Hang - One of the best experts on this subject based on the ideXlab platform.
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turbulent Convective Heat Transfer with molten salt in a circular pipe
International Communications in Heat and Mass Transfer, 2009Co-Authors: Liu Bin, Wu Yuting, Ma Chongfang, Ye Meng, Guo HangAbstract:In order to understand the Heat Transfer characteristics of molten salt and testify the validity of the well-known empirical Convective Heat Transfer correlations, an experimental study on turbulent Convective Heat Transfer with molten salt in a circular tube was conducted in this paper. Molten salt circulations were realized and operated in a specially designed system over 1000 h. The flow rates and temperatures of molten salt and mineral oil at the inlet and outlet in the test section were measured and the average forced Convective Heat Transfer coefficients of molten salt were determined by least-squares method. Finally, Heat Transfer correlations of turbulent flow with molten salt in a circular tube were obtained. Good agreement was observed between the experimental data of molten salt and the existing well-known correlations. The experimental data of molten salt in the present work are consistent with experimental results reported by different references in a wide range of Prandtl numbers from 0.7 to 59.9.
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Convective Heat Transfer in the laminar turbulent transition region with molten salt in a circular tube
Experimental Thermal and Fluid Science, 2009Co-Authors: Wu Yuting, Liu Bin, Ma Chongfang, Guo HangAbstract:In order to understand the Heat Transfer characteristics of molten salt and testify the validity of the well-known empirical Convective Heat Transfer correlations, experimental study on transition Convective Heat Transfer with molten salt in a circular tube was conducted. Molten salt circulations were realized and operated in a specially designed system over 1000 h. The average forced Convective Heat Transfer coefficients of molten salt were determined by least-squares method based on the measured data of flow rates and temperatures. Finally, a Heat Transfer correlation of transition flow with molten salt in a circular tube was obtained and good agreement was observed between the experimental data of molten salt and the well-known correlations presented by Hausen and Gnielinski, respectively.
G N Tiwari - One of the best experts on this subject based on the ideXlab platform.
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simulation performance of single slope solar still by using iteration method for Convective Heat Transfer coefficient
Groundwater for Sustainable Development, 2020Co-Authors: Ram Singh, G N TiwariAbstract:Abstract In the present paper, an attempt has been made to simulate the performance of solar still by using iteration method for an internal Convective Heat and evaporative (mass) Transfer coefficient which are used in basic energy balance equations. The energy balance is based on the first law of thermodynamics as a function of design and climatic parameters respectively. The internal Convective Heat Transfer coefficient plays a significant role in the performance of solar still. The iteration method based on Kumar and Tiwari model (KTM), which has not been considered earlier by any authors, has been adopted for numerical computation for the Convective Heat Transfer coefficient (hcw). Based on numerical computation for New Delhi climatic condition, it has been observed that the numerical values of hourly change of an internal Convective Heat Transfer coefficient (hcw) vary between 1.3 to 1.5 W/m2 0C, after fourth iteration process which is reduced by 11.7% in comparison with the first iteration.
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Convective Heat Transfer coefficient of crops in forced convection drying an experimental study
Energy Conversion and Management, 2001Co-Authors: S I Anwar, G N TiwariAbstract:In this paper, a simulation study has been conducted for determination of the Convective Heat Transfer coefficients of six crops, namely, green chillies, green peas, white gram, onion, potato and cauliflower under forced convection drying. Data obtained from experimentation under open and closed simulated conditions have been used to determine values of the coefficients C and n and, consequently, Convective Heat Transfer coefficient. The data have also been analysed in terms of per cent uncertainty.
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evaluation of Convective Heat Transfer coefficient in crop drying under open sun drying conditions
Energy Conversion and Management, 2001Co-Authors: S I Anwar, G N TiwariAbstract:Abstract In this paper, an attempt has been made to evaluate the Convective Heat Transfer coefficient operating in crop drying in open sun drying conditions (natural convection). Values of the constants, C and n were obtained by linear regression analysis from experimental data obtained for six crops, namely green chillies, green peas, Kabuli chana, onion, potato and cauliflower. Analysis was also performed for Kabuli chana under natural cooling conditions. Based on the values of C and n Convective Heat Transfer coefficients for these crops were determined. The experimental error in terms of percent uncertainty was also calculated.
Somchai Wongwises - One of the best experts on this subject based on the ideXlab platform.
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effect of thermophysical properties models on the predicting of the Convective Heat Transfer coefficient for low concentration nanofluid
International Communications in Heat and Mass Transfer, 2008Co-Authors: Weerapun Duangthongsuk, Somchai WongwisesAbstract:Abstract The term of nanofluid refers to a solid–liquid mixture with a continuous phase which is a nanometer sized nanoparticle dispersed in conventional base fluids. In order to study the Heat Transfer behavior of the nanofluids, precise values of thermal and physical properties such as specific Heat, viscosity and thermal conductivity of the nanofluids are required. There are a few well-known correlations for predicting the thermal and physical properties of nanofluids which are often cited by researchers to calculate the Convective Heat Transfer behaviors of the nanofluids. Each researcher has used different models of the thermophysical properties in their works. This article aims to summarize the various models for predicting the thermophysical properties of nanofluids which have been commonly cited by a number of researchers and use them to calculate the experimental Convective Heat Transfer coefficient of the nanofluid flowing in a double-tube counter flow Heat exchanger. The effects of these models on the predicted value of the Convective Heat Transfer of nanofluid with low nanoparticle concentration are discussed in detail.
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effect of thermophysical properties models on the predicting of the Convective Heat Transfer coefficient for low concentration nanofluid
International Communications in Heat and Mass Transfer, 2008Co-Authors: Weerapun Duangthongsuk, Somchai WongwisesAbstract:Abstract The term of nanofluid refers to a solid–liquid mixture with a continuous phase which is a nanometer sized nanoparticle dispersed in conventional base fluids. In order to study the Heat Transfer behavior of the nanofluids, precise values of thermal and physical properties such as specific Heat, viscosity and thermal conductivity of the nanofluids are required. There are a few well-known correlations for predicting the thermal and physical properties of nanofluids which are often cited by researchers to calculate the Convective Heat Transfer behaviors of the nanofluids. Each researcher has used different models of the thermophysical properties in their works. This article aims to summarize the various models for predicting the thermophysical properties of nanofluids which have been commonly cited by a number of researchers and use them to calculate the experimental Convective Heat Transfer coefficient of the nanofluid flowing in a double-tube counter flow Heat exchanger. The effects of these models on the predicted value of the Convective Heat Transfer of nanofluid with low nanoparticle concentration are discussed in detail.
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a critical review of Convective Heat Transfer of nanofluids
Renewable & Sustainable Energy Reviews, 2007Co-Authors: Weerapun Daungthongsuk, Somchai WongwisesAbstract:A nanofluid is a suspension of ultrafine particles in a conventional base fluid which tremendously enhances the Heat Transfer characteristics of the original fluid. Furthermore, nanofluids are expected to be ideally suited in practical applications as their use incurs little or no penalty in pressure drop because the nanoparticles are ultrafine, therefore, appearing to behave more like a single-phase fluid than a solid-liquid mixture. About a decade ago, several published articles focused on measuring and determining the effective thermal conductivity of nanofluids, some also evaluated the effective viscosity. There are only a few published articles on deriving the forced Convective Heat Transfer of nanofluids. The purpose of this article is to summarize the published subjects respect to the forced Convective Heat Transfer of the nanofluids both of experimental and numerical investigation.
Liu Bin - One of the best experts on this subject based on the ideXlab platform.
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turbulent Convective Heat Transfer with molten salt in a circular pipe
International Communications in Heat and Mass Transfer, 2009Co-Authors: Liu Bin, Wu Yuting, Ma Chongfang, Ye Meng, Guo HangAbstract:In order to understand the Heat Transfer characteristics of molten salt and testify the validity of the well-known empirical Convective Heat Transfer correlations, an experimental study on turbulent Convective Heat Transfer with molten salt in a circular tube was conducted in this paper. Molten salt circulations were realized and operated in a specially designed system over 1000 h. The flow rates and temperatures of molten salt and mineral oil at the inlet and outlet in the test section were measured and the average forced Convective Heat Transfer coefficients of molten salt were determined by least-squares method. Finally, Heat Transfer correlations of turbulent flow with molten salt in a circular tube were obtained. Good agreement was observed between the experimental data of molten salt and the existing well-known correlations. The experimental data of molten salt in the present work are consistent with experimental results reported by different references in a wide range of Prandtl numbers from 0.7 to 59.9.
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Convective Heat Transfer in the laminar turbulent transition region with molten salt in a circular tube
Experimental Thermal and Fluid Science, 2009Co-Authors: Wu Yuting, Liu Bin, Ma Chongfang, Guo HangAbstract:In order to understand the Heat Transfer characteristics of molten salt and testify the validity of the well-known empirical Convective Heat Transfer correlations, experimental study on transition Convective Heat Transfer with molten salt in a circular tube was conducted. Molten salt circulations were realized and operated in a specially designed system over 1000 h. The average forced Convective Heat Transfer coefficients of molten salt were determined by least-squares method based on the measured data of flow rates and temperatures. Finally, a Heat Transfer correlation of transition flow with molten salt in a circular tube was obtained and good agreement was observed between the experimental data of molten salt and the well-known correlations presented by Hausen and Gnielinski, respectively.
Jan Carmeliet - One of the best experts on this subject based on the ideXlab platform.
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an adjusted temperature wall function for turbulent forced Convective Heat Transfer for bluff bodies in the atmospheric boundary layer
Building and Environment, 2011Co-Authors: Thijs Defraeye, Bert Blocken, Jan CarmelietAbstract:Accurate Convective Heat Transfer predictions are required in building engineering and environmental studies on urban Heat islands, building energy performance, building-envelope durability or conservation and (natural) ventilation of buildings. When applying computational fluid dynamics (CFD) for these computationally-expensive studies at high-Reynolds numbers, wall functions are mostly used to model the boundary-layer region. In this study, an adjustment to the standard temperature wall function is proposed for forced Convective Heat Transfer at surfaces of typical wall-mounted bluff bodies in turbulent boundary layers, such as the atmospheric boundary layer, at moderate to high Reynolds numbers. The methodology to determine this customised temperature wall function (CWF) from validated numerical data of CFD simulations using low-Reynolds number modelling (LRNM) is explained, where a logarithmic-law behaviour is found. The performance of this CWF is evaluated for several bluff-body configurations. Standard wall functions (SWFs) yield deviations of about 40% for the Convective Heat Transfer coefficient, compared to LRNM. With the CWF however, these deviations are reduced to about 10% or lower. The CWF therefore combines increased (wall-function) accuracy for Convective Heat Transfer predictions with the typical advantage of wall functions compared to LRNM, being a lower grid resolution in the near-wall region, which increases computational economy and facilitates grid generation. Furthermore, this CWF can be easily implemented in existing CFD codes, and is implemented in the commercial CFD code Fluent in this study.