Effect of Dimpled Rib with Arc Pattern on Hydrothermal Characteristics of Al 2 O 3 -H 2 O Nanofluid Flow in a Square Duct

Anil Kumar, Rajesh Maithani (), Sachin Sharma, Sunil Kumar, Mohsen Sharifpur (), Tabish Alam, Naveen Kumar Gupta and Sayed M. Eldin
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Anil Kumar: Mechanical Engineering Department, UPES, Dehradun 248007, India
Rajesh Maithani: Mechanical Engineering Department, UPES, Dehradun 248007, India
Sachin Sharma: Mechanical Engineering Department, UPES, Dehradun 248007, India
Sunil Kumar: Yogananda School of AI, Computers and Data Sciences, Shoolini University, Solan 173229, India
Mohsen Sharifpur: Nanofluids Research Laboratory, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
Tabish Alam: CSIR-Central Building Research Institute, Roorkee 247667, India
Naveen Kumar Gupta: Mechanical Engineering Department, Institute of Engineering & Technology, GLA University, Mathura 281406, India
Sayed M. Eldin: Center of Research, Faculty of Engineering, Future University in Egypt, New Cairo 11835, Egypt

Sustainability, 2022, vol. 14, issue 22, 1-16

Abstract: The present work is concerned with the experimental analysis of the thermal and hydraulic performance of A l 2 O 3 − H 2 O nanofluid flow in dimpled rib with arc pattern in a square duct. The Alumina nanofluid consists of nanoparticles having a size of 30 nm. Reynolds number R e n u m studied in the square duct range from 5000 to 26,000. The nanoparticle volume fraction ( ϕ n p ) ranges from 1.5% to 4.5%, the ratio of dimpled-arc-rib-height to print-diameter H A D / P d ranges from 0.533 to 1.133, the ratio of the dimpled-rib-pitch to rib height P A D / H A D range from 3.71 to 6.71 and dimpled arc angle ( α A D ) range from 35° to 65°. The A l 2 O 3 − H 2 O -based nanofluid flow values of Nusselt number N u r s and friction factor f r s are higher in comparison to pure water. The dimpled ribs in the arc pattern significantly improved the thermal-hydraulic performance of the investigated test section. The nanoparticle concentration of 4.5%, the ratio of dimpled arc rib height to print diameter of 0.933, the relative dimpled arc rib height of 4.64 and the dimpled arc angle of 55° deliver the maximum magnitude of the heat transfer rate. The maximum value of the thermal-hydraulic performance parameters was found to be 1.23 for A l 2 O 3 − H 2 O -based nanofluid flow in a dimpled rib with arc pattern square duct for the range of parameters investigated. Correlations of N u r s , f r s and η r s have been developed for the selected range of operating and geometric parameters.

Keywords: dimpled rib; rough surface; nanofluids; friction factor; turbulence (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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