Impact of magnetic field generated using neodymium-iron-boron magnetic pairs on condensation heat transfer coefficient for tetrafluroethane (R134a)

Abstract

A magnetic field produced using neodymium-iron-boron has been employed in recent years to enhance the performance of thermal systems. Its impact on the condensation heat transfer coefficient, however, has not been studied. In this work, convective heat transport was experimentally assessed while tetrafluroethane condensed in a smooth straight tube with an inner diameter of 8.38 mm. A total of four magnetizers were used in the tests, each of which had a 3000 Gauss intensity and a mean vapor quality between 0.4 and 0.5 for saturation temperatures between 40 and 45. The findings demonstrated that the coefficient of heat transfer was considerably impacted by the external magnetic field, saturation temperature, and mean vapor quality. It was found that regardless of the quantity of magnetizers, the coefficient of heat transfer normally decreases as the saturation temperature rises. Lower saturation temperatures and greater mean vapor quality were determined to be the conditions where the magnetic field's impact was more pronounced. There is a limit to how much the heat transfer coefficient may grow as the number of magnetizer’s increases. The limiting magnetizers for the current investigation were discovered to be two magnetizers. The heat transfer coefficient increased by 15.2 percent for the optimal number of magnetizers with saturation temperature and mean vapor quality of 40 and 0.5, whereas it increased by 8.65 percent for saturation temperature and mean vapor quality of 45 and 0.5.