Experimental Study Of Trapezoidal-wave Enhanced Heat Transfer In Tube

Facing the world’s energy shortage, and constantly developing new energy andnew energy-saving technology have become an important researching topic.Strengthen heat transfer has been widely used in many industrial fields, such as:energy, power,chemical industry, metallurgy, machinery, food, transportation, aviationand aerospace, and its performance directly affects the efficiency of energy use. So,theenhanced heat exchanger device has become an important way of energy-savingprojects. This paper uses a systematic experimental study of enhanced heat transfercharacteristics of trapezoidal wave with the built-in heat transfer enhancement oftheoretical analysis and experimental research, the main research work are as follows:(1) Convective heat transfer of the theoretical basis used in built-in trapezoidalwave with a heat exchanger tube side heat transfer enhancement and fluid resistancecharacteristics, indicating that the tube through additional built-in trapezoidal wavewith the heat exchange tubes within the fluid mass to move to the wall along thetrapezoidal wave with oblique piece back to the central flow, in order to improve theheat transfer coefficient and enhance the heat transfer characteristics.(2) By the oretical analysis of the trapezoidal wave enhanced heat transfermechanism,this paper has designed trapezoidal wave heat exchanger components inthe tube. Produced and completed trapezoidal-wave spoiler elements of the differentstructural forms and combinations.(3) By requirements and purpose of the experiment of trapezoidal wave bandenhanced heat transfer, this paper has designed enhancement heat transferexperimental apparatus, and done theoretical analysis and calculation of heatexchanger, verify that the experimental device is practical and reliable. two differentviscosity fluids were used for experimental study of heat exchanger components.(4) Using the heat exchanger device platform, built-in trapezoidal wave with aheat exchanger element pilot study on the tube, get tube built-in trapezoidal wave withheat exchanger heat transfer coefficient h and the dielectric fluid in the tube velocity vcurve and possession of built-in trapezoidal wave with P curve of the heat exchangertube side fluid resistance. Compared to the smooth tube heat exchanger, heat transferefficiency of built-in trapezoidal wave with a heat exchanger is improved by about126%~220%. (5) In this study, through enhanced heat transfer performance evaluation criteria(PEC) to inserts of the trapezoidal wave with spoiler elements of heat exchange tubes,heat transfer evaluation.Trapezoidal wave with spoiler elements can make the thermalperformance of heat exchanger be strengthened.