TY - JOUR
TI - Influence of thermophysical properties on magnetite water-based ferrofluid heat transfer at sphere surface under magnetic field and thermal radiation
AU - Mat Yasin Siti Hanani
AU - Mohamed Muhammad Khairul Anuar
AU - Ismail Zulkhibri
AU - Salleh Mohd Zuki
JN - Thermal Science
PY - 2022
VL - 26
IS - 101
SP - 117
EP - 123
PT - Article
AB - This theoretical study investigated the effect of thermophysical properties  on Nusselt number when the magnetic field and thermal radiation are exposed  to the ferrofluid flow at the lower stagnation point of a hot sphere  surface. The thermo-physical properties are important mechanisms considered  in the heat transfer process. Besides, the ferroparticles volume fraction is  one of the variables that can enhance the thermophysical properties that are  exclusively studied on thermal conductivity and thermal diffusivity of  ferrofluid. Therefore, the correlation between the ferroparticles volume  fraction and thermophysical properties is measured by the Pearson  product-moment correlation coefficient method. The strength of association  and the direction of the relationship between these pertinent variables are  exhibited in ferrofluid flow composed of magnetite (Fe3O4) and water (H2O).  Regression analysis is implemented to predict the effect of the  ferroparticles volume fraction on the Nusselt number. The results show a  positive correlation between ferroparticles volume fraction and thermal  conductivity as well as between ferroparticles volume fraction and thermal  diffusivity. Further-more, a simple linear regression model proposed to  predict the Nusselt number when increasing the ferroparticles volume  fraction resulted in statistically significant and given minuscule  residuals value.