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Numerical simulation of nanofluid flow in concentric double pipes heat exchanger with circular and square pipes
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Reza Nafei1   , Hamoun Pourmirzaagha *2 |
1- Department of Mechanical Engineering, Langroud Branch, Islamic Azad University, Langroud, Iran
2- Department of Mechanical Engineering, Ramsar Branch, Islamic Azad University, Ramsar, Iran , H.pourmirzaagha@yahoo.com |
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Abstract: (65 Views) |
Heat exchangers are widely used in various industries, including power plants, solar cells, refineries, and automobiles. One of the simplest types of heat exchangers used in the industry is the double-pipe heat exchanger. In the present study, nanofluid flow in a double-pipe heat exchanger, with a square inner pipe and a circular outer pipe (sc), is simulated and investigated using computational fluid dynamics under constant heat flux and within the range of laminar and turbulent flow regimes. To verify the accuracy of the numerical study in both laminar and turbulent flows, the numerical calculation results for water flow with forced convection were compared with reference results. The results showed that with an increase in the Reynolds number, particularly in the turbulent flow regime, the Nusselt number in nanofluid flow increased more than in water flow. For instance, for aluminum oxide nanofluid flow with a Reynolds number of 500, the Nusselt number increases by nearly 5% more than water flow, and for a Reynolds number of 20000, this Nusselt number increase is close to 20% more. To investigate the impact of nanoparticle type on heat transfer and pressure drop, three types of nanoparticles were considered. The results indicated that the use of nanoparticles had a slight effect on the friction coefficient while significantly enhancing heat transfer.
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Article number: 2 |
| Keywords: Nano-fluid, Double pipe heat exchanger, Computational fluid dynamics, Heat transfer |
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Full-Text [PDF 1492 kb]
(40 Downloads)
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Type of Study: Research |
Subject:
Heat exchangers
Received: 2024/04/23 | Accepted: 2024/07/31 | Published: 2024/09/18
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