Heat transfer coefficient and thermal performance of heat pipe with R134a/mineral oil nanodiamond+Fe3O4 hybrid nanorefrigerant

Experimental research has been done on the heat transfer coefficient and thermal performance of heat pipe operating with R134a/mineral oil (5:1% weight percent) based nanodiamond+Fe3O4 hybrid nanorefrigerants. The in-situ growth approach was used to create the hybrid nanoparticles, which were subsequently characterized by X-ray diffraction. Using a vibrating sample magnetometer, the prepared sample magnetic measurement was determined. The studies were conducted with varying heat inputs of 100, 150, and 200 W and with particle loadings of 0.1%, 0.5%, and 1.0%, respectively. The results show that when using hybrid nanofluids instead of base fluid, the wall temperatures at the evaporator and condenser sections of heat pipe are lower. At a heat supply of 200 W, the average temperature in evaporator and condenser sections are reduced by 30.08% and 19.21%, respectively. At f = 1.0% vol. loading and 200 W, the thermal resistances in the evaporator and condenser sections drop to 24.58% and 21.74%, respectively. In comparison to the base fluid, the heat transfer coefficients of the evaporator and condenser are greater to 37.08% and 30.24%, respectively, at a heat input of 200 W. The thermal performance of the heat pipe is enhanced by employing the hybrid nanoparticles based nanorefrigerant, and it is also increased with increasing particle loadings.

Automated summary

Experimental research was conducted on the heat transfer coefficient and thermal performance of a heat pipe using hybrid nanorefrigerants of R134a/mineral oil (5:1% weight percent) and nanodiamond+Fe3O4. The hybrid nanoparticles were created using an in-situ growth approach and characterized by X-ray diffraction. The results showed that the use of hybrid nanofluids reduced the wall temperatures in the evaporator and condenser sections of the heat pipe and improved the heat transfer coefficients. The thermal performance of the heat pipe was enhanced with increasing particle loadings.