Effect of geometric size of curved delta winglet vortex generators and tube pitch on heat transfer characteristics of fin-tube heat exchanger

This paper presents a comprehensive review on heat transfer augmentation and pressure loss reduction of compact heat exchanger (CHXs) by using interrupted surfaces in the form of vortex generators (VGs). The influence of type, shape, and design and attack angle of VGs on enhancement of heat transfer rate and pressure loss are widely discussed. The sole objective of this review is to gather major thermodynamic features of CHXs presented by researchers through both experimental and numerical investigation for innovative designing purpose of heat exchangers. We have evaluated the effects of different types of vortex generators, their arrangement, location, attack angles and height on heat transfer and friction characteristics of heat exchangers. It was noticed that longitudinal vortices induced by vortex generators leads to the reduction of wake region behind tubes, augmentation of turbulence intensity and higher flow mixing. However, the intensity and strength of these vortices is strictly dependent on Reynold number. Delta winglet type vortex generators provide better heat transfer performance than rectangular winglet type vortex generators. Location of these winglets is quite suitable in downstream region than upstream region. Moreover, flow visualization techniques are discussed to analyze the vortex formation due to VGs at microscopic level.

Heat transfer enhancement using different types of vortex generators (VGs): A review on experimental and numerical activities

Numerical simulation on performances of plane and curved winglet type vortex generator pairs with punched holes

Thermal–hydraulic performance of fin-and-oval tube compact heat exchangers with innovative design of corrugated fin patterns

Fin-and-tube heat exchangers are the mostly used heat exchangers for thermal energy conversion with wide range of applications such as air conditioning, refrigeration, automotive industry, electronic devices, and the like. Demand of more efficient cooling by more compact heat exchangers leads to tremendous researches on this subject. In this paper, a detailed review of experimental and numerical researches upon different mechanisms of heat transfer enhancement in fin-and-tube heat exchangers are performed and the relevant influences and operating conditions are thoroughly reviewed. Effects of different geometrical parameters on heat transfer and pressure drop in each mechanism are also discussed in details. Furthermore, comparisons between different mechanisms of heat transfer improvement and some novel compound designs of fin-and-tube heat exchangers are discussed. In addition, some special researches on surface treatment, particle deposition, thermal contact, and fabrication material in fin-and-tube heat exchangers are described. Finally, some developed correlations for calculation of heat transfer and pressure drop characteristics of fin-and-tube heat exchangers with their ranges of validation are classified and compared.

Heat transfer enhancement in fin-and-tube heat exchangers – A review on different mechanisms

Heat transfer characteristics of a circular tube bank fin heat exchanger with fins punched curve rectangular vortex generators in the wake regions of the tubes

Bao Gong

Papers

Heat transfer characteristics of a circular tube bank fin heat exchanger with fins punched curve rectangular vortex generators in the wake regions of the tubes