Zhihao Sun

Bio: Zhihao Sun is an academic researcher from Harbin Institute of Technology. The author has contributed to research in topics: Electric field & Voltage. The author has an hindex of 2, co-authored 4 publications receiving 12 citations.

Principles Of Enhanced Heat Transfer

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Alternative Heat Transfer Enhancement Techniques for Latent Heat Thermal Energy Storage System: A Review

Abstract: Various enhancement techniques are proposed in the literature to alleviate heat transfer issues arising from the low thermal conductivity of the phase change materials (PCM) in latent heat thermal energy storage systems (LHTESS). The identified techniques include employment of fins, insertion of metal structures, addition of high conductivity micro/nanoparticles, micro-encapsulation, macro-encapsulation and cascaded PCMs arrangement. However, these conventional techniques tend to reduce the storage capacity as they generally add additional components/materials into the storage medium. On the other hand, if techniques such as direct contact heat exchange, ultrasonic vibration, electrohydrodynamics and movable PCM are employed, the storage volume would remain unaffected. Hence, the said techniques seem to have gained importance in PCM research in recent times. Although several review papers elaborating conventional techniques are available, none can be found on the aforementioned alternative class. Driven by the current scenario, this review paper intends to summarize past research on alternative heat transfer enhancement techniques employed for LHTESS. The critical analysis of the potential of each technique in enhancing the phase change heat transfer rate and their practical applicability are presented. Further, the present review evaluates relative merits/demerits and challenges/issues/limitations of these techniques to provide guidelines for future research.

Control of PCM melting process in an annular space via continuous or discontinuous fin and non-uniform magnetic field

Abstract: The latent heat of phase change materials (PCM) during the transition from solid to liquid has made them the subject of interest in many renewable energy applications such as thermal energy storage systems. Although, their low thermal conductivity is their main limitation. This paper extensively presents the melting behavior of phase change material inside the 3D cylindrical enclosure and proposes discrete and continuous novel fins shapes like annular, rectangular, and spiral for enhancing melting rate. The lauric acid with ferric oxide nanoparticles (0.03 %wt) is considered as PCM and the enthalpy-porosity method has been employed for simulating the melting process. Melting behavior and dominated heat transfer mechanism during the melting process have been analyzed. The results were compared with the cylindrical case without fins. Employing fins improved the melting rate because of increasing heat transfer area to 37.87 % and 31.8 % for continuous rectangular and spiral fins, respectively. The effect of applying a non-uniform magnetic field to the outer walls of the enclosure has been investigated and accelerated the melting rate of spiral fins up to 78 %. Furthermore, the effect of fins material on melting rate was examined and concluded that by employing copper fins, melting rate enhanced up to 3 % in comparison with aluminum fin. • The melting behavior of PCM in 3D cylindrical enclosure and proposed discrete and continuous novel fins shapes is presented. • The lauric acid is considered as PCM. • The enthalpy-porosity method has been employed for simulating the melting process. • The effect of applying a non-uniform magnetic field to the outer walls of the enclosure has been investigated.