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The heat exchangers are commonly used in thermal power companies, chemical factories, petroleum industries, and etc for the purpose of exchange heat from one fluid to another fluid. Wide varieties of heat exchangers are available and those are working with single phase fluids and they offer less thermal efficiency. The miniaturization of heat exchangers and its energy efficiency improvements has become an attractive point for the researchers. Improvement of energy efficiency of heat exchangers is possible by replacing the working fluid with high thermal conductivity fluids called as nanofluids. The nanofluids are recently developed fluids that promises, pronouncedly, greater heat absorbing and heat transport ability. Apart from that, the hybrid nanofluids are defined as the dilution of hybrid nanoparticles into the base fluids, which gives a synergistic properties compared to mono nanofluids as well as the base fluids. The hybrid nanofluids flow in heat exchangers may give higher energy efficiency because of the synergistic thermophysical properties. This review article attempts to discuss the available literature on the utilization of hybrid nanofluids in a wide variety of heat exchangers. First section of this paper will discuss about the availability of various hybrid nanoparticles synthesis techniques and followed by hybrid nanofluids production, stability and thermo-physical properties. The second section of this paper will discuss about the utilization of hybrid nanofluids in a different heat exchangers. The review is also inspects the use of hybrid nanofluids in a heat exchangers based on the experimental and numerical studies. A review of previously suggested research works for the use of hybrid nanofluids and also discussed its overall performance.
L. Syam Sundar (Fri,) studied this question.