Effect of rotation on forced convection in wavy wall channels

Abstract

In this paper, flow field and heat transfer performance in stationary and rotating wavy channels with different shapes were numerically investigated. Three different geometries were generated through three different values of phase-shift angles of = 0, 90 and 180 degrees between ∅ the two opposite wavy walls. A cell-centred finite-volume technique was employed to solve the three-dimensional governing equations based on the SIMPLE algorithm technique. Besides, the Menter k-SST turbulence model was used to simulate the turbulent flow in the current study. The wavelength and wave amplitude of the channel examined were L w =20 mm and a=2 mm, respectively. Numerical simulations were carried out over a range of design and operating conditions including the phase-shift angle of = 0-180 degrees, Reynolds number of Re=1,000-∅ 10,000, and rotating speed of 0-1000 rpm. The results showed that the surface-averaged Ω = Nusselt number increases as Re increases for all shapes of the wavy channel, however, at the expense of the raised pressure losses. Also, the wavy channel with a phase-shift of = 0 deg ∅ showed the highest enhancement in the performance of heat transfer followed by that of 90 ∅ = and 180 deg, respectively. The rotation had a strong impact on the flow field and heat transfer performance. With the increase of rotating speed, lower wall heat transfer coefficient significantly increased, while the upper wall heat transfer coefficient exhibited a slight increase, indicating that those three different geometries of the wavy channels had a good versatility at various values of rotating speeds. The numerical results were compared with those available in the literature, and the results were in a good agreement.

Magnetic Field Effect and Heat Transfer of Nanofluids within Waveform Microchannel

“…Heidary et al [9] numerically studied the heat transfer and flow field in a nanofluid wavy channel and showed that the heat transfer in the channels could be enhanced by 50% with adding nanoparticles and usage wavy horizontal walls. Al-Zurfi et al [26] numerically investigated the flow field and heat transfer performance in fixed and rotating wave channels with different shapes. They found that as the rotation velocity increased, the lower wall heat transfer coefficient increased significantly, while the upper wall heat transfer coefficient increased slightly.…”

Analysis of hydrothermal performance for laminar forced convective flow through a wavy channel with porous blocks

“…The early experimental and theoretical investigations related to the forced convective flow through wavy channels have been investigated by Rush et al (1999) and Wang and Chen (2002), respectively. Recently, several studies investigated the forced convective flow through corrugated channels (Al-Zurfi et al , 2020; Alsabery et al , 2021; Aminian et al , 2020; Shahsavar et al , 2021; Mehta and Pati, 2020a, 2020b, 2021b, 2021c, 2021d; Mehta et al , 2022a, 2022b; Aldor et al , 2022; Bayer et al , 2022; Khoshvaght-Aliabadi et al , 2022; Pourhammati and Hossainpour, 2022; Yoon et al , 2022). Tiwari and Moharana (2020) analyzed the conjugate forced convective flow through wavy and raccoon channels and observed a higher performance factor for the raccoon microchannel than the wavy and straight ones.…”

“…Tiwari and Moharana (2020) analyzed the conjugate forced convective flow through wavy and raccoon channels and observed a higher performance factor for the raccoon microchannel than the wavy and straight ones. Al-Zurfi et al (2020) studied the effect of rotation on the heat transfer characteristics in wavy channels and observed that rotational speed enhances the heat transfer. Recently, Alsabery et al (2021) studied the impact of nanofluid on the forced convective heat transfer using the particle tracking model and observed that as the size of the recirculation zone increases, nanoparticles are propelled away from the wall towards the channel core.…”

Effect of Deformable Baffle on the Forced Convection of Nanofluid Flow in Corrugated Channels

“…It was found that the trapezoid shape suggests a high Nusselt number. As for the relationship between the Reynolds number and the Nusselt number, it was studied by Al-Zurfi et al [29]. He employed a wavy channel with a phase angle of =0-180 and a range of Re=1000-10000.…”