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We employ 23 full factorial design to analyze the effect of temperature, volume fraction of hybrid nanofluids and channel height on heat transfer intensification through microchannel under laminar conditions. The range of temperature is varied from 30 ◦C to 50 ◦C and the volume fractions of hybrid nanoparticles TiO2/ZnO in ethylene glycol are varied from 1% to 4% and the channel height is varied from 200 μm to 400 μm. Using MINITAB 18 software, experiments were conducted with 24 runs using TiO2– ZnO/Ethylene glycol hybrid nanofluids in the rectangular microchannel heat exchanger. Based on this experimental study, various numerical simulations have been discussed and the applications of variance analysis, the effects of the different parameters on Nusselt number have been analyzed. The test results depict that all the three parameters have a significant effect on the thermal conductivity of TiO2–ZnO/ethylene glycol hybrid nanofluids, which enhances the Nusselt number as well as the heat transfer in the microchannel heat exchanger. The results show that maximum Nusselt number is obtained at higher temperature, volume fraction and microchannel.

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