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        Experimental Investigation of Convective Heat Transfer in a Narrow Rectangular Channel for Upward and Downward Flows

        조대성,OMAR S. AL-YAHIA,RAGA’I M. ALTAMIMI,박종학,채희택 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.2

        Heat transfer characteristics in a narrow rectangular channel are experimentally investigated for upward and downwardflows. The experimental data obtained are compared with existing data and predictions by many correlations. Based on theobservations, there are differences from others: (1) there are no different heat transfer characteristics between upward anddownward flows, (2) most of the existing correlations under-estimate heat transfer characteristics, and (3) existing correlationsdo not predict the high heat transfer in the entrance region for a wide range of Re. In addition, there are a few heat transfercorrelations applicable to narrow rectangular channels. Therefore, a new set of correlations is proposed with and withoutconsideration of the entrance region. Without consideration of the entrance region, heat transfer characteristics are expressedas a function of Re and Pr for turbulent flows, and as a function of Gz for laminar flows. The correlation proposed forturbulent and laminar flows has errors of ±18.25 and ±13.62%, respectively. With consideration of the entrance region, theheat transfer characteristics are expressed as a function of Re, Pr, and z* for both laminar and turbulent flows. The correlationfor turbulent and laminar flows has errors of ±19.5 and ±22.0%, respectively.

      • SCIESCOPUSKCI등재

        EXPERIMENTAL INVESTIGATION OF CONVECTIVE HEAT TRANSFER IN A NARROW RECTANGULAR CHANNEL FOR UPWARD AND DOWNWARD FLOWS

        Jo, Daeseong,Al-Yahia, Omar S.,Altamimi, Raga'i M.,Park, Jonghark,Chae, Heetaek Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.2

        Heat transfer characteristics in a narrow rectangular channel are experimentally investigated for upward and downward flows. The experimental data obtained are compared with existing data and predictions by many correlations. Based on the observations, there are differences from others: (1) there are no different heat transfer characteristics between upward and downward flows, (2) most of the existing correlations under-estimate heat transfer characteristics, and (3) existing correlations do not predict the high heat transfer in the entrance region for a wide range of Re. In addition, there are a few heat transfer correlations applicable to narrow rectangular channels. Therefore, a new set of correlations is proposed with and without consideration of the entrance region. Without consideration of the entrance region, heat transfer characteristics are expressed as a function of Re and Pr for turbulent flows, and as a function of Gz for laminar flows. The correlation proposed for turbulent and laminar flows has errors of ${\pm}18.25$ and ${\pm}13.62%$, respectively. With consideration of the entrance region, the heat transfer characteristics are expressed as a function of Re, Pr, and $z^*$ for both laminar and turbulent flows. The correlation for turbulent and laminar flows has errors of ${\pm}19.5$ and ${\pm}22.0%$, respectively.

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