Thermophysical Properties

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Somchai Wongwises - One of the best experts on this subject based on the ideXlab platform.

  • effect of sonication characteristics on stability Thermophysical Properties and heat transfer of nanofluids a comprehensive review
    Ultrasonics Sonochemistry, 2019
    Co-Authors: Somchai Wongwises, Amin Asadi, Farzad Pourfattah, Imre Miklos Szilagyi, Masoud Afrand, Gawel żyla, Ho Seon Ahn, Hoang Minh Nguyen, Ahmad Arabkoohsar
    Abstract:

    Abstract The most crucial step towards conducting experimental studies on Thermophysical Properties and heat transfer of nanofluids is, undoubtedly, the preparation step. It is known that good dispersion of nanoparticles into the base fluids leads to having long-time stable nanofluids, which result in having higher thermal conductivity enhancement and lower viscosity increase. Ultrasonic treatment is one of the most effective techniques to break down the large clusters of nanoparticles into the smaller clusters or even individual nanoparticles. The present review aims to summarize the recently published literature on the effects of various ultrasonication parameters on stability and thermal Properties of various nanofluids. The most common methods to characterize the dispersion quality and stability of the nanofluids have been presented and discussed. It is found that increasing the ultrasonication time and power results in having more dispersed and stable nanofluids. Moreover, increasing the ultrasonication time and power leads to having higher thermal conductivity and heat transfer enhancement, lower viscosity increase, and lower pressure drop. However, there are some exceptional cases in which increasing the ultrasonication time and power deteriorated the stability and Thermophysical Properties of some nanofluids. It is also found that employing the ultrasonic horn/probe devices are much more effective than ultrasonic bath devices; lower ultrasonication time and power leads to better results.

  • Thermophysical Properties heat transfer and pressure drop of cooh functionalized multi walled carbon nanotubes water nanofluids
    International Communications in Heat and Mass Transfer, 2014
    Co-Authors: Mohammad Hemmat Esfe, Seyfolah Saedodin, Omid Mahian, Somchai Wongwises
    Abstract:

    Abstract This paper is a continuation of the authors' previous work on the Thermophysical Properties, heat transfer, and pressure drop of nanofluids [Experimental Thermal and Fluid Science 52 (2014) 68–78]. In this paper, an experimental study is carried out to study the turbulent flow of COOH-functionalized multi-walled carbon nanotubes/water nanofluid flowing through a double tube heat exchanger. For this purpose, first, the Thermophysical Properties of the nanofluid, including the thermal conductivity and dynamic viscosity, have been measured at various temperatures and concentrations. Using the measured data, new correlations as a function of temperature and concentration are presented to predict the Thermophysical Properties. In the next step, the effects of low volume fractions of the nanofluid (from 0.05% to 1%) on the heat transfer rate are studied at the Reynolds numbers between 5000 and 27,000. The experimental results reveal that with increasing the nanofluid concentration, the heat transfer coefficient and thermal performance factor increase. On average, a 78% increase in heat transfer coefficient, a 36.5% increase in the average Nusselt number, and a 27.3% penalty in the pressure drop are recorded for the highest concentration of MWCNTs in water.

  • 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, 2008
    Co-Authors: Weerapun Duangthongsuk, Somchai Wongwises
    Abstract:

    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.

  • 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, 2008
    Co-Authors: Weerapun Duangthongsuk, Somchai Wongwises
    Abstract:

    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.

Weerapun Duangthongsuk - One of the best experts on this subject based on the ideXlab platform.

  • 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, 2008
    Co-Authors: Weerapun Duangthongsuk, Somchai Wongwises
    Abstract:

    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.

  • 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, 2008
    Co-Authors: Weerapun Duangthongsuk, Somchai Wongwises
    Abstract:

    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.

Angel G Fernandez - One of the best experts on this subject based on the ideXlab platform.

  • Thermophysical Properties of low cost lithium nitrate salts produced in northern chile for thermal energy storage
    Renewable Energy, 2017
    Co-Authors: Angel G Fernandez, Judith C Gomezvidal
    Abstract:

    Abstract In recent years, lithium containing salts have been studied for thermal energy storage (TES) applications because of their excellent Thermophysical Properties. In solar power plants, lithium is seen as a way to improve the Properties of state-of-the art molten salts used today. Lithium nitrate is a good candidate for sensible heat storage, because of its ability to increase the salt mixture's working temperature range. In the present research, Thermophysical Properties characterization of lithium nitrate containing salts, produced in Chile, have been carried out. Corrosion evaluations at 390 ° and 565 °C for 1000 h were performed for low chromium steel T22 and stainless steels (AISI 430 and AISI 316), respectively. Chemical composition of the salts including identification of corrosion products and impurities was determined and an estimation of the Chilean production costs is reported. The study shows a loss of thermal Properties after the corrosion tests. The heat capacity was reduced, possibly caused by the formation of oxides at high temperatures. The partial thermal decomposition of the salt was probably produced by the incorporation of corrosion products from the steel.

Judith C Gomezvidal - One of the best experts on this subject based on the ideXlab platform.

  • Thermophysical Properties of low cost lithium nitrate salts produced in northern chile for thermal energy storage
    Renewable Energy, 2017
    Co-Authors: Angel G Fernandez, Judith C Gomezvidal
    Abstract:

    Abstract In recent years, lithium containing salts have been studied for thermal energy storage (TES) applications because of their excellent Thermophysical Properties. In solar power plants, lithium is seen as a way to improve the Properties of state-of-the art molten salts used today. Lithium nitrate is a good candidate for sensible heat storage, because of its ability to increase the salt mixture's working temperature range. In the present research, Thermophysical Properties characterization of lithium nitrate containing salts, produced in Chile, have been carried out. Corrosion evaluations at 390 ° and 565 °C for 1000 h were performed for low chromium steel T22 and stainless steels (AISI 430 and AISI 316), respectively. Chemical composition of the salts including identification of corrosion products and impurities was determined and an estimation of the Chilean production costs is reported. The study shows a loss of thermal Properties after the corrosion tests. The heat capacity was reduced, possibly caused by the formation of oxides at high temperatures. The partial thermal decomposition of the salt was probably produced by the incorporation of corrosion products from the steel.

Murat Kenisarin - One of the best experts on this subject based on the ideXlab platform.

  • Thermophysical Properties of some organic phase change materials for latent heat storage a review
    Solar Energy, 2014
    Co-Authors: Murat Kenisarin
    Abstract:

    Abstract Past three decades are characterized by intensive investigations and the development of phase change materials for thermal energy storage. Latent heat storage is one of the most perspective methods of increasing efficiency in energy conservation and effective using sources of heat. Among available latent heat storage materials, the organic materials draw the attention of many researchers. It should be noted that the development of phase change materials advances the investigations of their Thermophysical Properties sufficiently. Knowledge of Thermophysical Properties is necessary condition for practical applications. The data on Thermophysical Properties of potential latent heat storage materials is dissipated in many scientific sources that are inaccessible, in many cases, for potential consumers of phase change thermal energy storage materials. This paper summarizes the results of previous investigations on transitions temperatures, heat of fusion, heat capacity, and thermal conductivity, long-term characteristics of many organic substances, their compositions, and compounds.