Heat transfer performance of pulsatingheat pipe with water based Fe3O4 fluid
                                                                    TANG Zhengnan, SU Lei
                  (School of Energy Science and Engineering, Nanjing Technology University, Nanjing 211186, China)

Abstract: Aiming at the heat transfer performance and influence factors of the oscillating heat pipe(OHP), on air cooling and electric heating experimental conditions,a water medium OHP and 13 kinds of Fe3O4 magnetic liquid OHPs were tested. The fluids concentration(1.5%，3%，4.5%，9%，12%), lengthheat segment length ratio（12∶14,14∶12,16.5∶9.5）, filling rate（30%，50%，70%）,structural changes,the magnetic field and angle and the heating power were included in test item.The influence law of OHPs were analyzed and summarized.The results indicate that the OHP with 4.5% mass concentration,50% filling rate,14∶12 length ratio,8 elbows,contour structure and nonmagnetic has the best heat transfer performance, the minimum thermal resistance is 85% lower than the water medium OHP, and the thermal conductivity is 340 times higher than copper.

Key words: pulsating heat pipe; waterbase Fe3O4 magnetic fluid; heattransfer performance; heatconducting property