TY - JOUR
T1 - Numerical evaluation of exergy efficiency of innovative turbulators in solar collector filled with hybrid nanofluid
AU - Ibrahim, Muhammad
AU - Berrouk, Abdallah S.
AU - Algehyne, Ebrahem A.
AU - Saeed, Tareq
AU - Chu, Yu Ming
N1 - Funding Information:
First and second authors acknowledge the financial support from Khalifa University of Science and Technology under Award No. CIRA-2019-031 and the support from Khalifa University of Science and Technology under award No. RCII-2018-024. The research was supported by the National Natural Science Foundation of China (Grant Nos. 11971142, 61673169). This project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, Saudi Arabia, under grant number (KEP-17-130-41). The authors, therefore, acknowledge with thanks DSR for technical and financial support.
Publisher Copyright:
© 2021, Akadémiai Kiadó, Budapest, Hungary.
PY - 2021/8
Y1 - 2021/8
N2 - In the current study, the impact of two-phase water-Al2O3-MWCNT hybrid nanofluid in turbulent flow on exergy efficiency in a solar collector equipped with innovative turbulators is investigated numerically. To simulate two-phase nanofluid, the mixture model was employed, and to simulate radiation and turbulent flow, the surface-to-surface (S2S) method and standard k-ε model were utilized. The study is performed for two-phase water-Al2O3-MWCNT hybrid nanofluid in Reynolds numbers (Re) of 5000–20,000, volume fraction (φ) of 1–3%, torsion ratios of 0.05, 0.15 and 0.25 at heights of 5, 10, 15 and 20 mm made of innovative turbulator. According to the results, exergy efficiency decreases with increasing torsion and height ratio in innovative turbulators. The highest exergy efficiency occurs at the Re = 20,000 and φ = 0.03 at a torsion ratio of 0.05 and a turbulator height of 5 mm. Also, the lowest extrusion efficiency occurs in Re = 5000 and φ = 0.01 in torsion ratio of 0.25 and turbulator height of 19 mm. This is while the exergy efficiency in the solar collector with turbulator with a height of 5 mm and a torsion ratio of 0.25 in Re = 20,000 and φ = 0.03 by 6.04% compared to the solar collector with the same characteristics in the ratio the torsion decreases by 0.05.
AB - In the current study, the impact of two-phase water-Al2O3-MWCNT hybrid nanofluid in turbulent flow on exergy efficiency in a solar collector equipped with innovative turbulators is investigated numerically. To simulate two-phase nanofluid, the mixture model was employed, and to simulate radiation and turbulent flow, the surface-to-surface (S2S) method and standard k-ε model were utilized. The study is performed for two-phase water-Al2O3-MWCNT hybrid nanofluid in Reynolds numbers (Re) of 5000–20,000, volume fraction (φ) of 1–3%, torsion ratios of 0.05, 0.15 and 0.25 at heights of 5, 10, 15 and 20 mm made of innovative turbulator. According to the results, exergy efficiency decreases with increasing torsion and height ratio in innovative turbulators. The highest exergy efficiency occurs at the Re = 20,000 and φ = 0.03 at a torsion ratio of 0.05 and a turbulator height of 5 mm. Also, the lowest extrusion efficiency occurs in Re = 5000 and φ = 0.01 in torsion ratio of 0.25 and turbulator height of 19 mm. This is while the exergy efficiency in the solar collector with turbulator with a height of 5 mm and a torsion ratio of 0.25 in Re = 20,000 and φ = 0.03 by 6.04% compared to the solar collector with the same characteristics in the ratio the torsion decreases by 0.05.
KW - Exergy efficiency
KW - Hybrid nanofluid
KW - Innovative turbulators
KW - Solar collector
KW - Turbulent flow
KW - Two-phase
UR - http://www.scopus.com/inward/record.url?scp=85104533120&partnerID=8YFLogxK
U2 - 10.1007/s10973-021-10759-6
DO - 10.1007/s10973-021-10759-6
M3 - Article
AN - SCOPUS:85104533120
SN - 1388-6150
VL - 145
SP - 1559
EP - 1574
JO - Journal of Thermal Analysis and Calorimetry
JF - Journal of Thermal Analysis and Calorimetry
IS - 3
ER -