CFD Analysis on the Air-Side Thermal-Hydraulic Performance of Multi-Louvered Fin Heat Exchangers at Low Reynolds Numbers

Abstract

Abstract:The air-side thermal-hydraulic performance of multi-louvered aluminium fin heat exchangers is investigated. A systematic numerical study has been performed to analyze the air-sde thermal hydraulic characteristics over a wide range of Reynolds number i.e., from 30 to 500. Air-side heat transfer coefficient and pressure drop were calculated and validated over the mentioned band of Reynolds numbers. The critical Reynolds number was determined numerically; and also the variation of flow pattern along with the air-side heat transfer coefficient and pressure drop in a multi-louvered heat exchanger associated with Re cri has been reported. Moreover, a parametric study of the multi-louvered aluminium fin heat exchangers was also performed for 36 heat exchanger configurations with the louver angles (19-31 • ); fin pitches (1.0, 1.2, 1.4 mm) and flow depths (16, 20, 24 mm); and the geometric configuration exhibiting the highest air-side heat transfer coefficient was reported. The air-side heat transfer coefficient and pressure drop results for different geometrical configurations were presented in terms of Colburn j factor and Fanning friction factor f ; as a function of Reynolds number based on louver pitch.

Seasonal Performance Investigation for Residential Heat Pump System with Different Outdoor Heat Exchanger Designs

“…This is because higher fin pitch leads to fewer fins that reduce available heat transfer surface area and pressure drop. However, at high Reynolds number, Colburn j factor decrement is more prominent as compared to friction factor f which leads to the reduction in system EER [36]. A similar trend was reported for wavy [13] and L-footed spiral [14] fin and tube heat exchangers.…”

Multifidelity simulation of underhood thermal system for a bus engine

“…Figure 12 shows that the CFD results are in good agreement with these empirical correlations. The highest error is at low Reynolds numbers (Re lp < 1200), where the flow is considered laminar [37], due to the simulation with turbulent model-375 ing. However, these low Reynolds numbers rarely occur at buses due to the heavy operation of the fans.…”

Analytical, Experimental, and Numerical Investigation of Energy in Hydraulic Cylinder Dynamics of Agriculture Scale Excavators

“…As the second main result, we analyze the analytical, experimental, and numerical energy behaviors in hydraulic cylinder dynamics from the port-Hamiltonian point of view and show that these behaviors are very close to each other. This is an unexpected result since the hydraulic cylinder dynamics in the nominal numerical simulator are much simpler than the experimental dynamics or Computational Fluid Dynamics (e.g., [22][23][24]). This implies that the port-Hamiltonian point of view would be applicable on the agricultural scale against modeling errors as well as on the laboratory scale.…”