A Review of Active Techniques for Improving Heat Transfer in Heat Exchangers Using the Impingement Jet Approach and the Potential Future of Nanocoating
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Impingement jets have several industrial uses, and their efficiency has been greatly increased. Heat transfer properties were significantly enhanced by jet impingement. The literature on the impingement jet system's heat transfer characteristics is reviewed in this research. Different control parameters characterise impinging air jets, and it is necessary to look into how these characteristics depend on performance-defining criteria. Increasing turbulent intensity, using nanofluid and improving surfaces by nanocoating, increasing heat transfer area, and creating vortex or secondary flows are all factors that must be taken into account in order to arrive at the optimal impinging jet geometry, which creates one or a combination of the following conditions that are favourable for heat transfer enhancement. One crucial concern is the possibility of improving certain traits. In order to optimise control factor combinations for an ideal impinging jet design, the current review looks at the thermodynamic behaviour of impingement jet techniques and reviews experimental and numerical studies published in the literature to investigate the dependence of control factors on heat transfer, flow characteristics, and decision-making techniques. By optimising heat transfer and system flow characteristics, this review offers researchers in the same sector a platform to construct a noble heat transfer enhancement contrivance in the form of jet control elements for enhancing thermal performance. This paper's primary contribution is its comprehensive discussion of the steady jet impingement heat transfer problem. According to the literature, using nanofluid technology and the ideal concentrations of the influencing elements can improve heat transfer characteristics. The choice of an appropriate impingement mechanism and surface coating with the nanosolution have a favourable impact on the rate of heat transmission.
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