The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Jacopo Buongiorno - One of the best experts on this subject based on the ideXlab platform.
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laminar convective heat transfer and viscous Pressure Loss of alumina water and zirconia water nanofluids
International Journal of Heat and Mass Transfer, 2009Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Abstract Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina–water and zirconia–water nanofluids in a flow loop with a vertical heated tube. The heat transfer coefficients in the entrance region and in the fully developed region are found to increase by 17% and 27%, respectively, for alumina–water nanofluid at 6 vol % with respect to pure water. The zirconia–water nanofluid heat transfer coefficient increases by approximately 2% in the entrance region and 3% in the fully developed region at 1.32 vol %. The measured Pressure Loss for the nanofluids is in general much higher than for pure water. However, both the measured nanofluid heat transfer coefficient and Pressure Loss are in good agreement with the traditional model predictions for laminar flow, provided that the loading- and temperature-dependent thermophysical properties of the nanofluids are utilized in the evaluation of the dimensionless numbers. In other words, no abnormal heat transfer enhancement or Pressure Loss was observed within measurement errors.
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experimental study of laminar convective heat transfer and viscous Pressure Loss of alumina water nanofluid
ASME 2008 First International Conference on Micro Nanoscale Heat Transfer Parts A and B, 2008Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina-water nanofluid in a flow loop with a vertical heated tube. The experimental results are in good agreement with traditional model predictions for laminar flow, if the loading- and temperature-dependent thermophysical properties are utilized. No abnormal heat transfer enhancement was observed. The heat transfer coefficients in the entrance region and in the fully-developed region are estimated to increase by 17% and 27%, respectively, for alumina nanofluid at 6 vol%. Measured Pressure Loss of the nanofluid is within 20% of theory. It is concluded that the nanofluid laminar convective heat transfer and viscous Pressure Loss behavior can be predicted by existing models as long as the correct mixture properties are used. This finding is consistent with our previous observation for alumina nanofluid tested in the fully-developed turbulent flow regime.Copyright © 2008 by ASME
Tom Mckrell - One of the best experts on this subject based on the ideXlab platform.
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laminar convective heat transfer and viscous Pressure Loss of alumina water and zirconia water nanofluids
International Journal of Heat and Mass Transfer, 2009Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Abstract Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina–water and zirconia–water nanofluids in a flow loop with a vertical heated tube. The heat transfer coefficients in the entrance region and in the fully developed region are found to increase by 17% and 27%, respectively, for alumina–water nanofluid at 6 vol % with respect to pure water. The zirconia–water nanofluid heat transfer coefficient increases by approximately 2% in the entrance region and 3% in the fully developed region at 1.32 vol %. The measured Pressure Loss for the nanofluids is in general much higher than for pure water. However, both the measured nanofluid heat transfer coefficient and Pressure Loss are in good agreement with the traditional model predictions for laminar flow, provided that the loading- and temperature-dependent thermophysical properties of the nanofluids are utilized in the evaluation of the dimensionless numbers. In other words, no abnormal heat transfer enhancement or Pressure Loss was observed within measurement errors.
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experimental study of laminar convective heat transfer and viscous Pressure Loss of alumina water nanofluid
ASME 2008 First International Conference on Micro Nanoscale Heat Transfer Parts A and B, 2008Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina-water nanofluid in a flow loop with a vertical heated tube. The experimental results are in good agreement with traditional model predictions for laminar flow, if the loading- and temperature-dependent thermophysical properties are utilized. No abnormal heat transfer enhancement was observed. The heat transfer coefficients in the entrance region and in the fully-developed region are estimated to increase by 17% and 27%, respectively, for alumina nanofluid at 6 vol%. Measured Pressure Loss of the nanofluid is within 20% of theory. It is concluded that the nanofluid laminar convective heat transfer and viscous Pressure Loss behavior can be predicted by existing models as long as the correct mixture properties are used. This finding is consistent with our previous observation for alumina nanofluid tested in the fully-developed turbulent flow regime.Copyright © 2008 by ASME
Linwen Hu - One of the best experts on this subject based on the ideXlab platform.
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laminar convective heat transfer and viscous Pressure Loss of alumina water and zirconia water nanofluids
International Journal of Heat and Mass Transfer, 2009Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Abstract Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina–water and zirconia–water nanofluids in a flow loop with a vertical heated tube. The heat transfer coefficients in the entrance region and in the fully developed region are found to increase by 17% and 27%, respectively, for alumina–water nanofluid at 6 vol % with respect to pure water. The zirconia–water nanofluid heat transfer coefficient increases by approximately 2% in the entrance region and 3% in the fully developed region at 1.32 vol %. The measured Pressure Loss for the nanofluids is in general much higher than for pure water. However, both the measured nanofluid heat transfer coefficient and Pressure Loss are in good agreement with the traditional model predictions for laminar flow, provided that the loading- and temperature-dependent thermophysical properties of the nanofluids are utilized in the evaluation of the dimensionless numbers. In other words, no abnormal heat transfer enhancement or Pressure Loss was observed within measurement errors.
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experimental study of laminar convective heat transfer and viscous Pressure Loss of alumina water nanofluid
ASME 2008 First International Conference on Micro Nanoscale Heat Transfer Parts A and B, 2008Co-Authors: Tom Mckrell, Linwen Hu, Jacopo BuongiornoAbstract:Laminar convective heat transfer and viscous Pressure Loss were investigated for alumina-water nanofluid in a flow loop with a vertical heated tube. The experimental results are in good agreement with traditional model predictions for laminar flow, if the loading- and temperature-dependent thermophysical properties are utilized. No abnormal heat transfer enhancement was observed. The heat transfer coefficients in the entrance region and in the fully-developed region are estimated to increase by 17% and 27%, respectively, for alumina nanofluid at 6 vol%. Measured Pressure Loss of the nanofluid is within 20% of theory. It is concluded that the nanofluid laminar convective heat transfer and viscous Pressure Loss behavior can be predicted by existing models as long as the correct mixture properties are used. This finding is consistent with our previous observation for alumina nanofluid tested in the fully-developed turbulent flow regime.Copyright © 2008 by ASME
Toshihide Ninagawa - One of the best experts on this subject based on the ideXlab platform.
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The heat transfer and Pressure Loss characteristics of a heat exchanger for recovering latent heat (the heat transfer and Pressure Loss characteristics of the heat exchanger with wing fin)
Heat Transfer Research, 2007Co-Authors: Kiyoshi Kawaguchi, Kenichi Okui, Takahiro Shimoura, Takaki Ohkouchi, Hiroyuki Osakabe, Toshihide NinagawaAbstract:In recent years the requirement for reduction of energy consumption has been increasing to solve the problems of global warming and the shortage of petroleum resources. A latent heat recovery type heat exchanger is one of the effective methods of improving thermal efficiency by recovering latent heat. This paper described the heat transfer and Pressure Loss characteristics of a latent heat recovery type heat exchanger having a wing fin (fin pitch: 4 mm, fin length: 65 mm). These were clarified by measuring the exchange heat quantity, the Pressure Loss of heat exchanger, and the heat transfer coefficient between outer fin surface and gas. The effects of condensate behavior in the fins on heat transfer and Pressure Loss characteristics were clarified. Furthermore, the equations for predicting the heat transfer coefficient and Pressure Loss which are necessary in the design of the heat exchanger were proposed. ©2007 Wiley Periodicals, Inc. Heat Trans Asian Res, 36(4): 215–229, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/htj.20154
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The Heat Transfer and Pressure Loss Characteristics of the Heat Exchanger for Recovering Latent Heat (The Heat Transfer and Pressure Loss Characteristics of the Heat Exchanger with Wing Fin)
Transactions of the Japan Society of Mechanical Engineers. B, 2006Co-Authors: Kiyoshi Kawaguchi, Kenichi Okui, Takahiro Shimoura, Takaki Ohkouchi, Hiroyuki Osakabe, Toshihide NinagawaAbstract:In recent years the requirement for reduction of energy consumption has been increasing to solve the problems of the global warming and the shortage of petroleum resources. The latent heat recovery type heat exchanger is one of the effective methods in order to improve thermal efficiency by recovering latent heat. This paper described that the heat transfer and Pressure Loss characteristics of the latent heat recovery type heat exchanger having wing fin (fin pitch : 4mm, fin length : 65mm) were clarified by measuring the exchange heat quantity, the Pressure Loss of heat exchanger, and the heat transfer coefficient between outer fin surface and gas, and that the effects of behavior of condensate in the fins on heat transfer and Pressure Loss characteristics were clarified. Furthermore the equations for predicting the heat transfer coefficient and Pressure Loss which are necessary on design of the heat exchanger were proposed.
S B Chen - One of the best experts on this subject based on the ideXlab platform.
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convective mass transfer and Pressure Loss characteristics of staggered short pin fin arrays
International Journal of Heat and Mass Transfer, 1994Co-Authors: R J Goldstein, M Y Jabbari, S B ChenAbstract:Abstract The effect of fin shape on the mass transfer and Pressure Loss of a ten-row staggered short pin-fin array in fully developed approaching flow is investigated experimentally using three different fin shapes. The Reynolds number, based on approach-velocity and fin diameter, ranges from 3000 to 18000. The fin shape affects the row-by-row variation of Sherwood number. The results indicate that the stepped-diameter circular fin arrays have not only a larger mass transfer coefficient, but also a smaller Pressure Loss compared to a uniform-diameter circular fin array. In stepped-diameter circular fin arrays, the effect of step-length-to-total-length ratio on Sherwood number is small, but the total mass transfer rate and Pressure Loss change significantly with this ratio, owing to differences in mass transfer area and free flow area, respectively.
