Experimental study on the heat transfer and flow characteristics of nanorefrigerants inside a corrugated tube |
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Affiliation: | 1. Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia;2. Department of Mechanical Engineering, KBU International College, 47800 Petaling Jaya, Selangor, Malaysia |
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Abstract: | The heat transfer and flow characteristics of MWCNT-R141b nanorefrigerant with different mass fractions have been studied through experiments. Experimental results were compared with existing correlations. A two-step method was used to prepare the nanorefrigerants. Span-80 was used as surfactant with an average particle diameter of 20 nm. Transmittance method was used to evaluate the stability of nanorefrigerants. Results showed that the stability of MWCNT-R141b nanorefrigerant, which is the added dispersant, was good during the experiments. The 0.3 wt% MWCNT-R141b nanorefrigerants had optimal heat transfer enhancement effects compared with pure refrigerants. The maximum Nusselt number increased by 40%. The specific pressure drop of nanorefrigerant increased as the Reynolds number (Re) increased, and the specific pressure drop of the pure refrigerant was minimum, which is similar to R141b. |
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Keywords: | Heat transfer Flow characteristics Nanorefrigerant Entropy generation Corrugated tube Transfert de chaleur Caractéristiques de l'écoulement Nanofrigorigène Production d'entropie Tube ondulé |
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