Enhancement of Heat Transfer in Partially Heated Vertical Channel Under Mixed Convection by Using Al₂O₃ Nanoparticles

Abstract

Laminar mixed convection in a two-dimensional symmetrically and partially heated vertical channel is investigated. The heaters are located on both walls and uniform temperature is applied on the heated sections. The number of heaters is considered as 1, 4, 8, and 10. Aluminum oxide/water nanofluid is considered as working fluid and the inlet velocity is uniform. The continuity, momentum and energy equations with appropriate boundary conditions are solved in dimensionless form, numerically. The study is performed for Richardson number of 0.01 and 10, Reynolds number of 100 and 500, and nanofluid volume fraction of 0% and 5%. Based on the obtained velocity and temperature distributions, the local and mean Nusselt number is calculated and plotted for different cases. The variation of the mean Nusselt number with the number of the heated portions is also discussed. It is found that the addition of nanoparticles into the base fluid increases mean Nusselt number but the rate of increase depends on Reynolds, Richardson numbers and number of heated portions. It is possible to increase mean Nusselt number 138% by increasing Reynolds number from 100 to 500, Richardson number from 0.01 to 10 and number of heated portions from 1 to 10 when volume fraction value is 5%.

Baffle effects on enhancing cooling performance of electronic components by nanofluid in a horizontal channel

“…Dogonchi et al (2020) numerically investigated the effects of nanoparticles shape factors on natural convection in a porous annulus filled with a nanoliquid formed between the elliptical cylinder and square enclosure. A comprehensive investigation was performed by Celik et al (2018) on the flow behavior of nanofluid combined mixed convection inside a partially heated vertical channel, and the obtained results are useful to design a new system that use nanofluid in cooling of partially conductive walls. In the same context, Da Silva et al (2005) and Bazylak et al (2006) analyzed the most effective way to distribute discrete heat sources that are cooled through Cooling performance of electronic components natural convection in channels and enclosures.…”

Numerical Study of Lid-Driven Hybrid Nanofluid Flow in a Corrugated Porous Cavity in the Presence of Magnetic Field

“… * constant value; remark: if using dimensionless numbers, the ranges are based on common academic proposals in the literature [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. …”

“…Celik et al [ 9 ] numerically investigated the heat transfer enhancement within a vertical channel, where a nanofluid passes through. The results showed that the heat transfer rate would enhance by increasing the Reynolds and Richardson numbers and adding 5% of nanoparticles.…”

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