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The Effect of Injected Air Bubble Size on the Thermal Performance of a vertical shell and Helical Coiled Tube Heat Exchanger

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Energy Engineering 2021年第6期118卷 1595-1609页

作者： Saif S.Hasan Ali Sh.Baqir Hameed B.Mahood Engineering Technical College Al-Furat Al-Awsat Technical UniversityAl-Najaf31001Iraq Department of Chemical and Process Engineering Faculty of Engineering and Physical SciencesUniversity of SurreyGuildfordGU27XHUK

In the present study,the effect of injecting air bubble size on the thermal performance of a vertical counter-current shell and coiled tube heat exchanger is experimentally *** experiments were accomplished in a cylindrical shape heat exchanger with a 50 cm height and 15 cm outer *** coil with 3.939 m equivalent length and 0.6 cm outer diameter was used to carry the hot fluid(water).Four different cold fluid(shell side)flow rates(Q_(s)=2;4;6 and 8 LPM)Þunder laminar flow conditions(316≤Re≤1223),constant hot(coil side)flow rate fluid rates(Q_(h)=1 LPM),four different injected air flow rates(Q_(a)=0:5;1;1:5 and 2 LPM),invariant temperature difference(ΔT=20°C),and constant bubble’s number(1400)were *** demonstrate the effect of bubble size,a sparger with orifice diameters of 0.1,0.8,and 1.5 mm was manufactured and used in the *** overall heat transfer coefficient(U),NTU,effectiveness,and pressure loss were *** experimental results clearly showed that the heat exchanger’s thermal efficiency significantly improved with increasing the shell side flow rate and the injected air flow *** maximum improvement in U,NTU,and effectiveness was 153%,153%,and 68%,*** thermal performance of the heat exchanger was shown to be improved with increasing the bubble *** the latter finding agrees with recent CFD published results,more studies need to be confirmed.

关键词： Sparger smooth helical coil vertical shell heat exchanger injection bubbles

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