Recent Advances in Heat Exchanger Design Highlighting Nanofluids and Perforated Baffle Optimization

Abstract

The desire for increasing the thermal efficiency and conserving energy in the modern engineering system, developments in heat exchanger (HE) technologies have come about in certain ways. This review highlights the recent developments that have evolved in the use of nanofluids along with perforated baffle designs to synergistically improve heat transfer performance. Nanofluids, engineered suspensions of nanoparticles in base fluids, provide higher thermal conductivity and convective heat transfer capacity and thus favor a variety of thermal systems. Their application in experimental and numerical ideas shows an increase in the Nusselt number, thermal conductivity, and at system levels, performance even for low concentrations. Likewise, to this day, structural innovations such as the use of perforated and twisted baffles, sectoral baffles, and helical fin arrangements of meets discontinuities in thermal boundary layers and fluid mixing. These geometrical improvements impart an optimized flow path, reduction in fouling, and a balance in pressure drop, all resulting in an overall enhancement of energy efficiency. This paper attempts to highlight the integrated performance enhancement when used together from nanofluids and duly designed baffle systems, drawing on more than a dozen recent investigations into this field. This review also outlines fabrication approaches, simulation techniques such as CFD, and material selection pathways deemed vital to the compact and highly enhanced heat exchanger of the future. Adapting system designs to particular operating conditions is becoming more and more dependent on computational methods, especially CFD and ANN-based optimizations. Notwithstanding the benefits, issues like material compatibility, nanofluid stability, and economic viability still need to be addressed. However, the combination of baffle innovation and nanofluid technology offers a strong foundation for the development of next-generation heat exchangers. Smart, self-regulating systems that adjust to changing thermal loads while optimizing energy efficiency and reducing environmental impact should be the main focus of future study.