Mahdizadeh, H and Nor Mariah, A (2021) Numerical study of heat transfer in 90° bend tube by ai<sub>2</sub>o<sub>3</sub> nano fluids using fluid injection. Journal of Engineering, Design and Technology, 19(1), pp. 127-148. ISSN 1726-0531
Abstract
This paper aims to investigate increasing heat transfer in bend tube 90° by fluid injection using nano fluid flow that was performed by expending varying Reynolds number. This paper studies the increased heat transfer in the bent tube that used some parameters to examine the effects of volume fraction, nanoparticle diameter, fluid injection, Reynolds number on heat transfer and flow in a bend pipe. Designing curved tubes increases the thermal conductivity amount between fluid and wall. It is used the finite volume method and simple algorithms to solve the conservation equations of mass, momentum and energy. The results showed that the nanoparticles used in bent tube transfusion increase the heat transfer performance by increasing the volume fraction; it has a direct impact on enhancing the heat transfer coefficient. Heat transfer coefficient enhanced 1.5% when volume fraction increased from 2 % to 6%, the. It is due to the impact of nanoparticles on the thermal conductivity of the fluid. The fluid is injected into the boundary layer flow due to jamming that enhances heat transfer. Curved lines used create a centrifugal force due to the bending and lack of development that increase the heat transfer. This study has investigated the effect of injection of water into a 90° bend before and after the bend. Specific objectives are to analyze effect of injection on heat transfer of bend tube and pressure drop, evaluate best performance of mixing injection and bend in different positions and analyze effect of nano fluid volume fraction on injection.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | conservation; heat transfer; performance |
| Index terms: | finite volume method, tube, injection, Reynolds number, pressure drop, conservation, jamming, thermal conductivity |
| Subjects: | environmental policy, fluid mechanics, materials science, networking, engineering analysis, manufacturing engineering, material properties and characteristics |
| Topics: | Construction Materials, Engineering Principles, Sustainability, Design Practice |
| Descriptive scope: | 2 CA |
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