Application of Carbon-based Nanofluids in Heat Exchangers: Current Trends
- Authors: Borode, Adeola O , Ahmed, Noor A , Olubambi, Peter A
- Date: 2019
- Subjects: Graphene , Carbon Nanotubes , Nanofluids
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/405828 , uj:34095 , Citation: Borode, A.O., Ahmed, N.A., Olubambi, P.A. 2019 : Application of Carbon-based Nanofluids in Heat Exchangers: Current Trends. Journal of Physics: Conference Series 1378 (2019) 032061. DOI:10.1088/1742-6596/1378/3/032061.
- Description: Abstract : The thermal performance of a heat exchanger can be enhanced by adding carbon nanostructured materials such as carbon nanotubes and graphene to the conventional working fluid. When nanomaterials are suspended in the working fluid, the fluid is known as Nanofluid. The enhancement in the thermal and rheological properties of the fluid is responsible for the augmentation in heat transfer performance. The influence of carbon nanomaterial on the thermophysical properties, heat transfer characteristics and flow properties are reviewed. The current trends on the utilization of carbon-based nanofluids in heat exchangers were reported. The study shows that carbon-based nanofluids have the potential to improve the performance of heat exchanger and reduce the cost of fabrication by reducing heat exchange area. The study identifies the scope for future study.
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On the numerical solution of double-diffusive convection in regular and nanofluid flow
- Authors: Mkhatshwa, Musawenkhosi Patson
- Date: 2015
- Subjects: Numerical analysis , Heat - Convection , Nanofluids , Microfluidics
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/84703 , uj:19254
- Description: Abstract: Please refer to full text to view abstract , M.Sc. (Applied Mathematics)
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Pressure distribution study of aluminum oxide nanofluids using particle image velocimetry
- Authors: Mubishi, Clayton Anesu
- Date: 2018
- Subjects: Nanofluids , Aluminum oxide , Particle image velocimetry
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/297315 , uj:32410
- Description: Abstract: This study was conducted to establish the pressure distribution of an aluminium oxide/water nanofluid colloidal suspensions. Nanofluids have been seen to be effective mediums for heat and mass transfer, due to their enhanced transport properties. This is useful, currently for trying to find efficient solutions for the reduction of energy demands in the industry. The mechanisms for the enhancements in the transport properties remains a challenge in order to commercialize the use of nanofluids in industry. The pressure distribution of the flow of fluids is thus a tool that has been used to better understand the flow dynamics of fluids and make cost-effective designs for the use of nanofluids. This study was conducted to view how the pressure distribution of nanofluid changes with changes in the flow regimes as well as nanoparticle concentration. The nanofluid was attained using the two-step method in which the nanoparticle was prepared first then dispersed into the base fluid by mechanical action. The resulting nanofluid was then allowed to flow through a particle image velocimetry system and a velocity field obtained. The pressure distribution was then calculated from this velocity field data using the discretization of the Poisson equation. It was found that the velocity of nanofluid decreased with increasing nanoparticle concentration being 0.1% and 0.2% by mass, having average velocities of 1.62 × 10-3 m/s, 1.107 × 10-3 m/s and 8.43 × 10-4 m/s for deionised water and the two concentrations of the nanofluid respectively. Nanofluids exhibit higher pressures than their base fluids at the same fluid flow rates with average pressures of 11.39kPa for deionised water, 27.674kPa for 0.1% nanofluid and 37.134kPa for 0.2% nanofluid. This information can thus be used to establish a unified mechanism for the enhancement of transport properties of nanofluids. , M.Tech. (Chemical Engineering)
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