| China is an important energy-consuming country,but its per energy reserves are less than half of the world average.How to efficiently use energy has become a bottleneck problem restricting China's economic and social development.The heat exchanger equipment transfers part of the heat of the hot fluid to the cold fluid through heat exchange to achieve energy exchange.It is a general equipment in the chemical industry,petroleum,power,food and many other industrial sectors.Studying the heat exchange mechanism of heat exchanger equipment,developing heat exchangers,and optimizing the structure of heat exchangers have become one of the most concerned topics for many engineers and academics.In this paper,a numerical simulation method is used to study an interleaved spoiler element in the tube.The heat exchange amount,temperature field,temperature distribution in the heat exchanger tube,pressure field,pressure drop,velocity vector field are compared after inserting the spoiler element,Analyze the influence curves of different Reynolds numbers on the heat transfer factor j and friction factor f,combined with the results of heat transfer efficiency,the optimal parameters of a single set of variables are obtained.By using the control variable method and orthogonal experiment,the influence of the physical structure of the spoiler element on the heat exchange characteristics of the heat exchanger is systematically studied,and the optimal structural parameters of the spoiler element in the tube under the current simulation conditions are obtained.(1)When the spiral angle of the turbulent element in the tube is 30 °,the heat transfer capacity is the highest,which is 398.46 KW.The pressure drop is the lowest at 0 °,20653.2 Pa;the pressure drop is the highest at 45 °,39906.4 Pa,and the heat exchange efficiency of the heat exchanger is thehighest when the spiral angle is 30 °.(2)The heat dissipation capacity is highest at 413.97 KW when the center diameter of the spoiler element in the tube is 4mm;the highest pressure drop is 35752.2Pa when the diameter is 3mm;the lowest pressure drop is18443.4Pa when the diameter is 6mm and the center diameter is 4mm When the heat exchanger has the highest heat exchange efficiency.(3)The number of lobes of the turbulent element in the tube is 6 lobes with the highest heat transfer capacity of 398.46KW;4 lobes with the lowest pressure drop of 21121.58Pa;10 lobes with the highest pressure drop of56512.77 Pa and 6 lobes The heat exchange efficiency is the highest.(4)In the eight groups of orthogonal experiments,the heat dissipation of the turbulent element in the tube has a spiral angle of 30°,a central of 4mm,and a number of 6 petals,which is 365.5KW;the angle is 30°,the center The pressure drop is the highest at 44079.15 Pa when the diameter is 4mm and8 petals;the angle is 30°,the center diameter is 5mm and the pressure drop is the lowest when the 6 petals are 23445.69 Pa,and the angle is 30°and the central diameter is 4mm and 6 petal The heat exchanger has the highest heat exchange efficiency.(5)The major factors affecting the pressure drop of the heat exchanger are: number of petals> helix angle> center diameter;the major factors affecting the heat exchange of the heat exchanger are: center diameter> helix angle> number of petals The main factors affecting the heat exchange efficiency of the heat exchanger are the number of lobes> helix angle> center diameter.The interpolated turbulence element can obviously improve the heat transfer efficiency of the heat exchange pipe and has the advantages of simple manufacturing process,flexible installation,easy scale removal,etc.,which is very suitable for the transformation of the existing heat exchanger heat pipe. |
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