The Effects Of Pulsating Flow On Heat Transfer Augmentation Of Self-vibration Spring Inserted Tube

In the areas of the national economy and industrial production, the heat exchangerwas widely used. At present, some scholars’ study has focused on the self-vibrationspring inserted tube and found that it can enhance the heat transfer, and the othersscholars’ study has revealed that the tube with the pulsating flow in can improve the heattransfer coefficient too. But At home and abroad, so far, there is almost no study of thecombination of these two methods. Thus, through the combination method of numericalsimulation and experimental study, the effects of the pulsating flow on the heat transferenhancement of the self-vibration spring inserted tube are analyzed. The main researchworks and conclusions are as follows:（1）The inserted spring Tubes flow and heat transfer mathematical modelestablished, finite volume method is applied for the numerical discretization, the model issolved by the FLUENT software. Respectively obtain inserted spring pass into the flowand heat transfer characteristics of steady flow and pulsatile flow in the tubes, the resultsshow that: Compared with steady flow conditions, pulsatile flow for heat exchange tubesnear the wall constantly induce swirl generation, migration and shedding, enhanced tubediameter direction (temperature gradient direction) energy and mass transport, has a greateffect on heat transfer enhancement.（2）The effects of the different parameters (frequency and amplitude) on the heattransfer of inserted spring heat exchange tube in the case of pulsating flow was simulated,and the tube temperature and pressure fields are got. By analyzing the different pulsatileflow parameters flow field, it is found that with the pulsating flow amplitude increases,the heat transfer coefficient increases, and can increase up to58%, while the frequency ofpulsating flow is helpful for heat transfer enhancement, some pulsating flow frequencyweaken the effects of heat transfer, When f=6HZ, the effect of heat transfer is the best,when f=8HZ, The effect of heat transfer is the worse, enhanced heat transfer coefficientis reduced to1.17.（3）The inserted spring tube heat transfer experimental platform and control system are established. The effects of flow parameters of the steady flow and pulsating flow onheat transfer enhancement of inserted spring pulsating flow heat exchange tubes isexperimental studied. The results show that: the effects of the pulsating flow on heattransfer are significantly better than that of the steady state flow. And the pulsatile flowparameters play a decisive role. The heat transfer coefficient increases with the pulsatingflow amplitude increases. Furthermore, the pulsating have a different influence as thefrequency increases. When the frequency f=6HZ, the effect of heat transfer is best. Thisconclusion is consistent with the conclusions of the numerical simulation, which verifythe accuracy of numerical simulation.