Nusselt Number Prediction for Oil and Water in Solar Tubular Cavity Receivers

Authors

  • Reyhaneh Loni Department of Biosystems Engineering, Tarbiat Modares University (T.M.U.), Tehran, Iran
  • Gholamhassan Najafi Department of Biosystems Engineering, Tarbiat Modares University (T.M.U.), Tehran, Iran
  • Rizalman Mamat Center for Research in Advanced Fluid and Process, University Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan 26300, Pahang, Malaysia
  • Mohd Fairusham Ghazali Center for Research in Advanced Fluid and Process, University Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan 26300, Pahang, Malaysia
  • Nor Azwadi Che Sidik Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia

DOI:

https://doi.org/10.37934/arfmts.97.2.157174

Keywords:

Nusselt number prediction, solar cavity receivers, thermal oil, water

Abstract

In this study, a numerical model was developed for prediction of Nusselt number in solar cavity receivers. Thermal oil and water were used as the working fluid. A dish concentrator with different shapes of the cavity receiver, including hemispherical, cylindrical, and cubical, was investigated. The different shapes of cavity receiver were studied under the same operating conditions for prediction of the internal heat transfer coefficient correlation for each cavity receiver. The system is investigated under the variation of solar radiation, flow rate, and inlet temperature of solar working fluids. The developed thermal model is validated based on the experimental data for the cylindrical cavity receiver using thermal oil. The results reveal that the hemispherical cavity receiver had the highest cavity heat gain, heat transfer coefficient, and Nusselt number values compared to two other cavity receivers. It could be concluded that the cavity heat gain, and heat transfer coefficient, and Nusselt number amounts had improved with increasing solar radiation, increasing flow rate, and decreasing inlet temperature of the working fluid. Some equations were suggested for prediction of Nusselt number with the variation of solar radiation, flow rate of the working fluid, and inlet temperature of working. It was concluded that application of thermal oil had resulted in higher Nusselt numbers than the use of water as the solar working fluid. Consequently, the application of oil is suggested for high-temperature systems.

Author Biographies

Reyhaneh Loni, Department of Biosystems Engineering, Tarbiat Modares University (T.M.U.), Tehran, Iran

rloni@uma.ac.ir

Gholamhassan Najafi, Department of Biosystems Engineering, Tarbiat Modares University (T.M.U.), Tehran, Iran

g.najafi@modares.ac.ir

Rizalman Mamat, Center for Research in Advanced Fluid and Process, University Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan 26300, Pahang, Malaysia

rizalman@ump.edu.my

Mohd Fairusham Ghazali, Center for Research in Advanced Fluid and Process, University Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan 26300, Pahang, Malaysia

fairusham@ump.edu.my

Nor Azwadi Che Sidik, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia

azwadi@utm.my

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Published

2022-07-14

How to Cite

Reyhaneh Loni, Najafi, G., Rizalman Mamat, Mohd Fairusham Ghazali, & Che Sidik, N. A. . (2022). Nusselt Number Prediction for Oil and Water in Solar Tubular Cavity Receivers. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 97(2), 157–174. https://doi.org/10.37934/arfmts.97.2.157174

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