Experimental Investigation of Heat Transfer Enhancement in a Rectangular Duct Using Circular and Triangular Ribs at 90<sup>0</sup> Orientation

Shrikant Murlidhar Bante

doi:10.26706/ijaefea.4.6.20191102

Experimental Investigation of Heat Transfer Enhancement in a Rectangular Duct Using Circular and Triangular Ribs at 90⁰ Orientation

Shrikant Murlidhar Bante
Volume 6: Issue 4, Dec 2019, pp 132-139

Author's Information

Shrikant Murlidhar Bante¹

Corresponding Author

¹Lecturer, Mechanical Engineering Department, Government Polytechnic, Bramhapuri, India

shrikant.bante769@gmail.com

Research Article -- Peer Reviewed

Published online – 30 Dec 2019

Open Access article under Creative Commons License

Cite this article – Shrikant Murlidhar Bante, “Experimental Investigation of Heat Transfer Enhancement in a Rectangular Duct Using Circular and Triangular Ribs at 90⁰ Orientation”, International Journal of Analytical, Experimental and Finite Element Analysis, RAME Publishers, vol. 6, issue 4, pp. 132-139, Dec 2019.

https://doi.org/10.26706/ijaefea.4.6.20191102

Abstract:-

Enhancement of heat transfer in compact heat exchangers is crucial for improving thermal system efficiency in various engineering applications. In the present study, an experimental investigation is carried out to evaluate the effect of artificial roughness in the form of circular and triangular ribs on the convective heat transfer characteristics of a rectangular duct at a fixed rib orientation of 90°. Experiments are conducted for three cases, namely, smooth duct (without ribs), circular ribs, and triangular ribs, over a range of air velocities from 4 to 4.3 m/s. The performance is analyzed in terms of heat transfer coefficient, Nusselt number, and heat transfer rate. The results indicate a significant enhancement in thermal performance for ribbed configurations compared to the smooth duct. The heat transfer coefficient is observed to increase by approximately 64% to 92% for circular ribs and 115% to 124% for triangular ribs relative to the smooth duct. Similarly, the Nusselt number shows an enhancement of about 64% to 73% for circular ribs and 115% to 124% for triangular ribs. The heat transfer rate is also improved by nearly 44% to 49% for circular ribs and 88% to 89% for triangular ribs. Among the tested configurations, triangular ribs exhibit superior performance due to enhanced turbulence generation and improved fluid mixing. The findings demonstrate the effectiveness of rib-induced artificial roughness in augmenting convective heat transfer.

Index Terms:-

Heat transfer, Convective heat transfer coefficient, Nusselt number, Reynold Number

REFERENCES

H.-M. Kim and K.-Y. Kim, “Design optimization of rib-roughened channel to enhance turbulent heat transfer,” Int. J. Heat Mass Transf., vol. 47, no. 23, pp. 5159–5168, 2004.
A. Kumar, R. P. Saini, and J. S. Saini, “Experimental investigation on heat transfer and fluid flow characteristics of air flow in a rectangular duct with Multi v-shaped rib with gap roughness on the heated plate,” Sol. Energy, vol. 86, no. 6, pp. 1733–1749, 2012.
A. Dewan, P. Mahanta, K. S. Raju, and P. S. Kumar, “Review of passive heat transfer augmentation techniques,” Proc. Inst. Mech. Eng. Part A J. Power Energy, vol. 218, no. 7, pp. 509–527, 2004.
A. N. Al-Shamani, K. Sopian, H. A. Mohammed, S. Mat, M. H. Ruslan, and A. M. Abed, “Enhancement heat transfer characteristics in the channel with Trapezoidal rib–groove using nanofluids,” Case Stud. Therm. Eng., vol. 5, pp. 48–58, 2015.
A. K. Shukla and A. Dewan, “Convective heat transfer enhancement using slot jet impingement on a detached rib surface,” J. Appl. Fluid Mech., vol. 10, no. 6, pp. 1615–1627, 2017.
S. Tabatabaeikia, H. A. Mohammed, N. Nik-Ghazali, and B. Shahizare, “Heat transfer enhancement by using different types of inserts,” Adv. Mech. Eng., vol. 6, p. 250354, 2014.
H. H. Cho, S. J. Wu, and H. J. Kwon, “Local heat/mass transfer measurements in a rectangular duct with discrete ribs,” J. Turbomach., vol. 122, no. 3, pp. 579–586, 2000.
G. Tanda, “Performance of solar air heater ducts with different types of ribs on the absorber plate,” Energy, vol. 36, no. 11, pp. 6651–6660, 2011.
J. Liu, G. Xie, and T. W. Simon, “Turbulent flow and heat transfer enhancement in rectangular channels with novel cylindrical grooves,” Int. J. Heat Mass Transf., vol. 81, pp. 563–577, 2015.
C. Gau and I. C. Lee, “Flow and impingement cooling heat transfer along triangular rib-roughened walls,” Int. J. Heat Mass Transf., vol. 43, no. 24, pp. 4405–4418, 2000.
P. Promvonge, T. Chompookham, S. Kwankaomeng, and C. Thianpong, “Enhanced heat transfer in a triangular ribbed channel with longitudinal vortex generators,” Energy Convers. Manag., vol. 51, no. 6, pp. 1242–1249, 2010.
S. K. Sharma and V. R. Kalamkar, “Experimental and numerical investigation of forced convective heat transfer in solar air heater with thin ribs,” Sol. Energy, vol. 147, pp. 277–291, 2017.
P. Singh, J. Pandit, and S. V. Ekkad, “Characterization of heat transfer enhancement and frictional losses in a two-pass square duct featuring unique combinations of rib turbulators and cylindrical dimples,” Int. J. Heat Mass Transf., vol. 106, pp. 629–647, 2017.
B. V. Ravi, P. Singh, and S. V. Ekkad, “Numerical investigation of turbulent flow and heat transfer in two-pass ribbed channels,” Int. J. Therm. Sci., vol. 112, pp. 31–43, 2017.
K. M. Kim, B. S. Kim, D. H. Lee, H. Moon, and H. H. Cho, “Optimal design of transverse ribs in tubes for thermal performance enhancement,” Energy, vol. 35, no. 6, pp. 2400–2406, 2010.
J. C. Han, J. S. Park, and C. K. Lei, “Heat transfer enhancement in channels with turbulence promoters,” 1985.
A. Boulemtafes-Boukadoum and A. Benzaoui, “CFD based analysis of heat transfer enhancement in solar air heater provided with transverse rectangular ribs,” Energy Procedia, vol. 50, pp. 761–772, 2014.
L. Wang and B. Sundén, “Experimental investigation of local heat transfer in a square duct with various-shaped ribs,” Heat Mass Transf., vol. 43, no. 8, pp. 759–766, 2007.
G. Tanda, “Heat transfer in rectangular channels with transverse and V-shaped broken ribs,” Int. J. Heat Mass Transf., vol. 47, no. 2, pp. 229–243, 2004.