Experimental investigation on enhancement of heat transfer using Al2O3/water nanofluid in a u-tube with twisted tape inserts

Prasad, P.V. Durga; Gupta, A.V.S.S.K.S.

doi:10.1016/j.icheatmasstransfer.2016.03.019

Cited by 53 publications

(9 citation statements)

References 5 publications

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“…Tiwari et al (2021) examined thermal performance of a THE using various flow rates of WO 3 /water nanofluid empirically. In a similar study, Prasad and Gupta (2016) experimentally HFF 33,6 surveyed the influence of the concentration on the efficiency of THE using Al 2 O 3 /water nanofluids. The findings represented that the increment in the thermal performance parameters of HE varied in direct proportion with the particle ratio.…”

Section: Concentric Heat Exchangermentioning

confidence: 99%

Numerical and experimental investigation for enhancing thermal performance of a concentric heat exchanger using different scenarios

Aytaç

Badali

Tuncer

2023

HFF

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Purpose Heat exchangers (HEs) which provide heat transfer and transfer energy through direct or indirect contact between fluids have an essential role in many processes as a part of various industries from pharmaceutical production to electronic devices. Using nanofluid as working fluid and integrating different types of turbulators could be used to upgrade the thermal effectiveness of HEs. Recently, to obtain more increment in thermal effectiveness, hybrid nanofluids are used that are prepared by mixing two or more various nanoparticles. The purpose of this experimental and numerical study is investigating different scenarios for improving the effectiveness of a concentric U-tube type HE. Design/methodology/approach In the numerical section of this study, different turbulator modifications, including circular and quarter circular rings, were modeled to determine the effect of adding turbulator on thermal performance. In addition, Al2O3/water and SiO2/water single and Al2O3–SiO2/water hybrid nanofluids were experimentally tested in an unmodified concentric U-tube HE in two different modes, including counter flow and parallel flow. Al2O3–SiO2/water hybrid nanofluid was prepared at 2% (wt./wt.) particle ratio and compared with Al2O3/water and SiO2/water single type nanofluids at same particle ratios and with distilled water. Findings Numerical modeling findings exhibited that integrating turbulators to the concentric tube type HE caused to raise in the effectiveness by improving heat transfer area. Also, experimental results indicated that using both hybrid and single type nanofluids notably upgraded the thermal performance of the concentric U-tube HE. Integrating turbulators cannot be an effective alternative in a concentric U-tube type HE with lower diameter because of raise in pressure drop. Numerically achieved findings exhibited that using quarter circular turbulators decreased pressure drop in comparison with circular turbulators. According to the experimental outcomes, using hybrid Al2O3–SiO2/water nanofluid leads to obtain more thermal performance in comparison with single type nanofluids. The highest increment in overall heat transfer coefficient of HE by using Al2O3–SiO2/water nanofluid achieved as 58.97% experimentally. Originality/value The overall outcomes of the current research exhibited the positive impacts of using hybrid nanofluid and integrating turbulators. In this empirical and numerical survey, numerical simulations were performed to specify the impact of applying different turbulators and hybrid nanofluid on the flow and thermal characteristics in a concentric U-tube HE. The achieved outcomes exhibited that using hybrid nanofluid can notably increase the thermal performance with negligible pressure drop in comparison with two different turbulator modifications.

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Section: Concentric Heat Exchangermentioning

confidence: 99%

Numerical and experimental investigation for enhancing thermal performance of a concentric heat exchanger using different scenarios

Aytaç

Badali

Tuncer

2023

HFF

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“…

of the whole pipe depicts an improvement of 32.91%, and

was enhanced up to 1.38 times for a nanofluid having 0.03% concentrations among helical strings of TR

respectively. Prasad and Gupta [ 74 ], Copyrights © Elsevier 2023.

of whole pipe with nanofluid having 0.03% concentrations depicts an improvement of 31.28% than that of

however,

was enhanced by 1.23 times as compared to

among helical strings of TR

respectively.…”

Section: The Major Techniques Of Ht Development In Ttmentioning

confidence: 99%

“…Prasad et al [ 73 ] studied the influence of HT by using the helical tape in HE. Prasad and Gupta [ 74 ] experimentally studied the performance of TT in U-tube HE. Azmi et al [ 76 ] examine the forced convection using nano-fluids with TT insertion in plain tube.…”

Section: The Major Techniques Of Ht Development In Ttmentioning

confidence: 99%

A review of different twisted tape configurations used in heat exchanger and their impact on thermal performance of the system

Khargotra

Kumar

Nadda

et al. 2023

Heliyon

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“…Similarly, in their study, Durga Prasad and Gupta 86 used Al 2 O 3 /water nanofluid in a U-tube heat exchanger with twisted tape inserts. The test section consisted of a U-bend double pipe heat exchanger (with inner tube and an annulus tube), flow meters, pump, by-pass valve and inlet and outlet pipe.…”

Section: Experimental Study Of Twisted Tape With Nanofluidmentioning

confidence: 99%

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Ahmad

Abdullah

Sopian

2020

Advances in Mechanical Engineering

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Working fluid with higher thermal conductivity and tube with better fluid mixing are two crucial elements for heat transfer enhancement in heat exchanger system. Hence, several methods and techniques have been explored to improve heat transfer efficiency, including dispersing nanoparticles into conventional heat transfer fluid and inserting instruments inside the tube of the heat exchanger. Studies have shown that nanofluid can improve heat transfer efficiency of the system due to its higher thermal conductivity and drastic Brownian motion of nanoparticles while inserts within tube can improve heat transfer efficiency by increasing axial velocity of working fluid for better fluid mixing. This article summarized 109 of journals from recent research on heat transfer enhancement of nanofluid flowing inside the tube with inserts as well as discussing the significant parameters that affected the system’s efficiency such as nanoparticles’ volume fraction, Reynolds number and types and configurations of inserts. Ultimately, analysis will be carried out to determine the most suitable modification of twisted tape inserts with the most optimum value of nanoparticle volume fraction for turbulence flow regime. Finally, some problems that need to be solved for future research such as agglomeration and pressure drop are discussed.

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Experimental investigation on enhancement of heat transfer using Al2O3/water nanofluid in a u-tube with twisted tape inserts

Cited by 53 publications

References 5 publications

Numerical and experimental investigation for enhancing thermal performance of a concentric heat exchanger using different scenarios

Numerical and experimental investigation for enhancing thermal performance of a concentric heat exchanger using different scenarios

A review of different twisted tape configurations used in heat exchanger and their impact on thermal performance of the system

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

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