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۱Experimental assessment on different insert shapes on performance of tubular heat exchangers
اطلاعات انتشار: کنفرانس بین المللی علوم مهندسی، هنر و حقوق، سال
تعداد صفحات: ۱۳
An experimental assessment on heat transfer enhancement inside a circular straight tubular heat exchanger equipped with different insertsis presented. The investigated parameters are (1) six different shapes of inserts: perforated–tape, jaggedtape, twisted–tape, helical–screw, vortex–generator, and offset–strip (2) sevenvolumetric flow rates: 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0 lit\min. Test results indicate that the thermal–hydraulic performance of the heat exchanger is strongly related to theshape of inserts. The tube fitted with the vortex–generator insert offers the highest values of the heat transfer coefficient and pressure drop compared to the other studied inserts<\div>

۲Experimental investigation of nanofluid flow inside Serpentine heat exchangers with variable pitch length
اطلاعات انتشار: کنفرانس بین المللی علوم مهندسی، هنر و حقوق، سال
تعداد صفحات: ۱۰
Indirect channels like the serpentine tubes are widely utilized in many engineering applications such as chemical and petrochemical industries, air conditioning and refrigeration systems, and modern energy conversion, etc. In the present work, the effect of straight section length variations on the performance of serpentine–tube heatexchangers is experimentally investigated. To obtain accurate results, a highly precise test loop with the ability to produce a constant wall temperature condition is designed and fabricated. It is found that creating short straight section lengths at the beginningof the serpentine tubes enhances both the heat transfer coefficient and pressure drop values. To obtain accurate results, a highly precise test loop with the ability toproduce a constant wall temperature condition is designed and fabricated. It is found that creating short straight section lengths at the beginning of the serpentine tubesenhances both the heat transfer coefficient and pressure drop values. However, this technique improves the overall thermal–hydraulic performance of the serpentine tubes about 10%.<\div>

۳Influences of delta–winglets on thermal–hydraulic performance of vortex–generator insert
اطلاعات انتشار: کنفرانس بین المللی علوم مهندسی، هنر و حقوق، سال
تعداد صفحات: ۱۰
Heat transfer enhancement in a tube using the vortex–generator (VG) insert with different arrangements of delta–winglets is investigated in the current study.Fourteen VG inserts with the longitudinaland forward arrangementof delta–wingletsare made from thealuminum sheets with length of 350 mm, width of 14.5 mm, and thickness of 0.6 mm.The heat transfer and pressure drop results achieved from the use of VG inserts inside the tube are compared with those obtained for the plain tube.It is foundthat at the transitional flow through the plain tube, Notter–Rouse equation predicts thecurrent experimental Nusseltnumber better than Gnielinski equation.Also, the experimental results reveal that the use of VG inserts inside the tube yields higherheat transfer coefficient and pressure drop than the plain tube, and these parameters augment with increasing the number of delta–winglet. The appropriate tradeoffbetween the enhanced heat transfer and the friction is found by using a special arrangement of delta–winglets on the VG insert which presents the highest heattransfer coefficient as well as the maximum values of considered performance evaluation criterion (PEC). The maximum PEC of 1.41 is found for this VG insert at the maximum Reynolds number.<\div>
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