Convective performance and particle effect analysis on aqua-antifreeze based oxomagnesium nanofluids while flowing through a micro-fin tube with twisted tapes

Krishnan, S. Suseel Jai; Nagarajan, P.K.

doi:10.1007/s10973-019-08336-z

Cited by 7 publications

(1 citation statement)

References 40 publications

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“…Although there was an increase in pressure drop, the heat transfer of the microfin pipe was still 80% higher than the smooth tube [17]. The technique of heat transfer enhancement by combining a microfin and nanofluids to improve the thermal performance of single phases on micro/minichannels has been investigated in previous studies [23][24][25]. It was concluded that a microfin inside a micro/minichannel conduit is very promising for high heat flux dissipation.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of TiO2/Water Nanofluids Flowing Inside a Square Minichannel with a Microfin Structure: A Numerical Investigation

et al. 2019

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A combination of two passive heat transfer enhancement techniques using a microfin structure and nanofluids was investigated numerically. TiO2/water nanofluids flowing inside a square minichannel with a microfin structure (SMM) were observed as a practical application. Increased heat transfer performance was investigated by observing the Nusselt number, friction factor, and performance evaluation criterion (PEC). Velocity and temperature profiles were also demonstrated at a laminar developing flow regime. The SMM used in this work had six microfins (N = 6) and TiO2/water nanofluids with various nanoparticle concentrations of 0.005, 0.01, and 0.1 vol.%. By combining nanofluids as working fluids and SMM as a passive heat transfer enhancement, the maximum PEC value of 1.2 was achieved at Re = 380 with a volume fraction of 0.01 vol.%. It is obvious that compared to water flowing inside the square minichannel microfin, the heat transfer can be increased by using only a nanofluid with a volume fraction of 0.01%. The combination of a microfin and nanofluids as working fluids is strongly recommended due to its excellent performance in terms of heat transfer and economic considerations.

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