دومین کنفرانس بین­ المللی «رویکردهای نوین در نگهداشت انرژی»، (Emerging Trends in Energy Conservation - ETEC) , 2013-03-02

Title : ( heat transfer enhancement in helical coiled tubes using Al2O3/water nanofluid )

Authors: Mostafa Kahani , Saeed Zeinali Heris , Seyed Mahmoud Mousavi ,

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Nanofluids and helical coils are two different techniques to enhance thermal performance of high efficient heat exchangers. By combining these techniques together energy efficiency of equipment could be increased dramatically. In the present work, the forced convective heat transfer and the pressure drop of nanofluid inside helical coils with a constant wall heat flux are studied experimentally. Distilled water was used as a host fluid and Nanofluids of aqueous Al2O3 nanoparticles (35 nm) suspensions were prepared in various volume concentrations of 0.25 ~1.0%. Nanofluids at all concentrations showed much higher heat transfer rate and pressure drop in comparison with distilled water, which is due to the nanoparticles present in the fluid. In addition, due to curvature of coils, significant enhancement was observed in heat transfer rate as well as pressure drop when helical coils utilize instead of straight one. Moreover, the heat transfer rate improved with the increase of pitch coils and decrease of curvature ratio.

Keywords

, helical coils, Al2O3/water nanofluid, Heat transfer enhancement, Pressure Drop, Curvature Ratio, Pitch
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@inproceedings{paperid:1039782,
author = {Kahani, Mostafa and Zeinali Heris, Saeed and Mousavi, Seyed Mahmoud},
title = {heat transfer enhancement in helical coiled tubes using Al2O3/water nanofluid},
booktitle = {دومین کنفرانس بین­ المللی «رویکردهای نوین در نگهداشت انرژی»، (Emerging Trends in Energy Conservation - ETEC)},
year = {2013},
location = {تهران, IRAN},
keywords = {helical coils; Al2O3/water nanofluid; Heat transfer enhancement; Pressure Drop; Curvature Ratio; Pitch spacing},
}

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%0 Conference Proceedings
%T heat transfer enhancement in helical coiled tubes using Al2O3/water nanofluid
%A Kahani, Mostafa
%A Zeinali Heris, Saeed
%A Mousavi, Seyed Mahmoud
%J دومین کنفرانس بین­ المللی «رویکردهای نوین در نگهداشت انرژی»، (Emerging Trends in Energy Conservation - ETEC)
%D 2013

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