Abstract
Re-engineering the channel heat exchangers (CHEs) is the goal of many recent studies, due to their great importance in the scope of energy transport in various industrial and environmental fields. Changing the internal geometry of the CHEs by using extended surfaces, i.e., VGs (vortex generators), is the most common technique to enhance the efficiency of heat exchangers. This work aims to develop a new design of solar collectors to improve the overall energy efficiency. The study presents a new channel design by introducing VGs. The FVM (finite volume method) was adopted as a numerical technique to solve the problem, with the use of Oil/MWCNT (oil/multi-walled carbon nano-tubes) nanofluid to raise the thermal conductivity of the flow field. The study is achieved for a Re number ranging from to , while the concentration () of solid particles in the fluid (Oil) is set to 4%. The computational results showed that the hydrothermal characteristics depend strongly on the flow patterns with the presence of VGs within the CHE. Increasing the Oil/MWCNT rates with the presence of VGs generates negative turbulent velocities with high amounts, which promotes the good agitation of nanofluid particles, resulting in enhanced great transfer rates.
Highlights
The insertion of turbulators and vortex generators (Ts-VGs) inside channel heat exchangers (CHEs) is well-known for its efficiency to enhance the convective heat transfer [1–7]
—They showed an increase in the performance due to the presence of wavy turbulators through a significant increase in the convective heat transfer coefficient
This paper aimed to develop a new design of SCHEs to improve their overall energy efficiency
Summary
The insertion of turbulators and vortex generators (Ts-VGs) inside channel heat exchangers (CHEs) is well-known for its efficiency to enhance the convective heat transfer [1–7]. Berner et al [8] characterized the turbulent flow details throughout a channel with segmented baffles. Webb et al [9] simulated the dynamic behavior inside a duct with transverse ribs. The significant increase in transfer of heat was reached for fluids with high Pr numbers, such as fluorocarbons or water. Demartini et al [10] mounted baffles on the surfaces of a rectangular duct to enhance the hydrothermal characteristics. Antoniou et al [11] employed the hot wire technique to inspect the flow pattern around a prism with different aspect ratios (L/H). The increase of L/H yielded a reattachment of flows on the prism surface and downstream, with a reduction of turbulence scales and recirculation lengths
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