Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.
Go to article

Bibliography

[1] W.A. Hermann. Quantifying global exergy resources. Energy, 31(12):1685–1702, 2006. doi: 10.1016/j.energy.2005.09.006.
[2] T. Alam, R.P. Saini, and J.S. Saini. Use of turbulators for heat transfer augmentation in an air duct – A review. Renewable Energy, 62:689–715, 2014. doi: 10.1016/j.renene.2013.08.024.
[3] A. Kumar, R.P. Saini, and J.S. Saini. Heat and fluid flow characteristics of roughened solar air heater ducts – A review. Renewable Energy, 47:77–94, 2012. doi: 10.1016/j.renene.2012.04.001.
[4] D. Kumar and L. Prasad. Heat transfer augmentation of various roughness geometry used in solar air heaters. International Journal of Mechanical Engineering and Technology, 8(12):491–508, 2017.
[5] R. Prakash, A.K. Singh, and P.A. Verma. The effect of roughness geometries on heat transfer enhancement in solar air heater – A review. International Journal on Recent and Innovation Trends in Computing and Communication, 6(4):286–291, 2018.
[6] N.N. Sheikh, B. Kumar, and N.K. Saini. A review paper on pin fin efficiency enhancement. International Journal of Applied Engineering Research, 14(8):108–112, 2019.
[7] M. Sethi, V. Goel, and N.S. Thakur. Correlations for solar air heater duct with dimpled shape roughness elements on absorber plate. Solar Energy, 86(9):2852–2861, 2012. doi: 10.1016/j.solener.2012.06.024.
[8] T.-M. Liou, J.-J. Hwang, and S.-H. Chen. Simulation and measurement of enhanced turbulent heat transfer in a channel with periodic ribs on one principal wall. International Journal of Heat and Mass Transfer, 36(2):507–517, 1993. doi: 10.1016/0017-9310(93)80025-P.
[9] M.A. Al-Nimr. Transient behaviour of a matrix solar air heater. Energy Conversion and Management, 34(8):649–656, 1993. doi: 10.1016/0196-8904(93)90099-V.
[10] A. Kumar, A. Gholap, R. Gangarde, S.M. Shinde, M.P. Vyavahare, V.B. Mete, and S.A. Borude. Performance of solar air heaters with corrugated absorber plate – A CFD approach. International Journal of Innovative Research and Advanced Studies, 4(11):76–86, 2017.
[11] W. Xu, S. Wang, L. Huang, Q. Wang, Q. Zhang, and H. Lu. Thermo-hydraulic performance of Therminol liquid phase heat transfer fluid in a ribbed tube of solar heater. Renewable Energy, 101:919–929, 2017. doi: 10.1016/j.renene.2016.09.043.
[12] C. Sivakandhan, T.V. Arjunan, and M.M. Matheswaran. Thermohydraulic performance enhancement of a new hybrid duct solar air heater with inclined rib roughness. Renewable Energy, 147(1):2345–2357, 2020. doi: 10.1016/j.renene.2019.10.007.
[13] S.K. Dehariya and A.R. Jaurker. Experimental analysis for enhancement of heat transfer in two pass solar air heater duct by using square rib in discrete geometry. International Research Journal of Engineering and Technology, 03(06):1839–1846, 2016.
[14] S. Alfarawi, S A. Abdel-Moneim, and A. Bodalal. Experimental investigations of heat transfer enhancement from rectangular duct roughened by hybrid ribs. International Journal of Thermal Sciences, 118:123–138, 2017. doi: 10.1016/j.ijthermalsci.2017.04.017.
[15] G. Tanda. Heat transfer in rectangular channels with transverse and V-shaped broken ribs. International Journal of Heat and Mass Transfer, 47(2):229–243, 2004. doi: 10.1016/S0017-9310(03)00414-9.
[16] V. Kesharwani and R. Vishwakarma. Numerical investigation of heat transfer and fluid flow characteristics of square type tabulator roughness solar air heater. International Journal of Mechanical and Industrial Technology, 3(2):109–116, 2016.
[17] A. Kumar and M.-H. Kim. Thermohydraulic performance of rectangular ducts with different multiple V-rib roughness shapes: A comprehensive review and comparative study. Renewable and Sustainable Energy Reviews, 54:635–652, 2016. doi: 10.1016/j.rser.2015.10.030.
[18] D. Jin, J. Zuo, S. Quan, S. Xu, and H. Gao. Thermohydraulic performance of solar air heater with staggered multiple V-shaped ribs on the absorber plate. Energy, 127:68–77, 2017. doi: 10.1016/j.energy.2017.03.101.
[19] V.S. Bisht, A.K. Patil, and A. Gupta. Review and performance evaluation of roughened solar air heaters. Renewable and Sustainable Energy Reviews, 81(1):954–977, 2018. doi: 10.1016/j.rser.2017.08.036.
[20] A. Kumar and M.-H. Kim. Effect of roughness width ratios in discrete multi V-rib with staggered rib roughness on overall thermal performance of solar air channel. Solar Energy, 119:399–414, 2015. doi: 10.1016/j.solener.2015.06.030.
[21] A.S. Yadav and J. L. Bhagoria. Modeling and simulation of turbulent flows through a solar air heater having square-sectioned transverse rib roughness on the absorber plate. The Scientific World Journal, 2013:ID827131, 2013. doi: 10.1155/2013/827131.
[22] S. Acharya, T. Myrum, X. Qiu, and S. Sinha. Developing and periodically developed flow, temperature and heat transfer in a ribbed duct. International Journal of Heat and Mass Transfer, 40(2):461–479, 1997. doi: 10.1016/0017-9310(96)00033-6.
[23] P.R. Chandra, C.R. Alexander, and J. C. Han. Heat transfer and friction behaviors in rectangular channels with varying number of ribbed walls. International Journal of Heat and Mass Transfer, 46(3):481–495, 2003. doi: 10.1016/S0017-9310(02)00297-1.
[24] S.A. Abdel-Moneim, E.F. Atwan, and A.R. El-Shamy. Heat transfer and flow friction in a rectangular duct with repeated multiple V-ribs mounted on the bottom wall. In Proceedings of the 12th International Mechanical Power Engineering Conference (IMPEC12), pages 11–25, 2001.
[25] A. Gupta, V. SriHarsha, S.V. Prabhu, and R.P. Vedula. Local heat transfer distribution in a square channel with 90° continuous, 90° saw tooth profiled and 60° broken ribs. Experimental Thermal and Fluid Science, 32(4):997–1010, 2008. doi: 10.1016/j.expthermflusci.2007.11.015.
[26] W. Siddique, T.H. Fransson, and L.A. El-Gabry. Improved design of internally cooled trailing edge at engine similar conditions: A conjugate heat transfer problem. In Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 4: Heat Transfer, Parts A and B, pages 1357-1372. Copenhagen, Denmark. June 11–15, 2012. doi: 10.1115/GT2012-68557.
[27] J.C. Han, Y.M. Zhang, and C.P. Lee. Augmented heat transfer in square channels with parallel, crossed, and V-shaped angled ribs. Journal of Heat Transfer, 113(3):590–596, 1991. doi: 10.1115/1.2910606.
[28] B. Sundén and T. Sköldheden. Heat transfer and pressure drop in a new type of corrugated channels. International Communications in Heat and Mass Transfer, 12(5):559–566, 1985. doi: 10.1016/0735-1933(85)90079-X.
[29] T. Salameh and B. Sunden. An experimental study of heat transfer and pressure drop on the bend surface of a U-duct. In Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 4: Heat Transfer, Parts A and B, pages 13-21. Glasgow, UK. June 14–18, 2010. doi: 10.1115/GT2010-22139.
[30] T. Salameh and B. Sunden. Effects of ribs on internal blade-tip cooling. In Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 5: Heat Transfer, Parts A and B, pages 1033-1041. Vancouver, British Columbia, Canada. June 6–10, 2011. doi: 10.1115/GT2011-45118.
[31] T. Salameh and B. Sunden. A numerical investigation of heat transfer in a smooth bend part of a U-duct. International Journal of Numerical Methods for Heat & Fluid Flow, 24(1):137–147, 2014. doi: 10.1108/HFF-03-2012-0066.
[32] T. Salameh and B. Sunden. Numerical investigation of convective heat transfer and pressure drop for ribbed surfaces in the bend part of a U-duct. In Proceedings of the ASME 2012 International Mechanical Engineering Congress and Exposition. Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, pages 1909-1916. Houston, Texas, USA. November 9–15, 2012. doi: 10.1115/IMECE2012-85621.
[33] L. Wang, T. Salameh, and B. Sunden. An experimental study of heat transfer on a smooth U-bend channel surface. In Proceedings of the ASME 2012 International Mechanical Engineering Congress and Exposition. Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, pages 1667-1674. Houston, Texas, USA. November 9–15, 2012. doi: 10.1115/IMECE2012-87295.
[34] A. Layek, J.S. Saini, and S.C. Solanki. Heat transfer and friction characteristics for artificially roughened ducts with compound turbulators. International Journal of Heat and Mass Transfer, 50(23-24):4845–4854, 2007. doi: 10.1016/j.ijheatmasstransfer.2007.02.042.
[35] E.A.M. Elshafei, M.M. Awad, E. El-Negiry, and A.G. Ali. Heat transfer and pressure drop in corrugated channels. Energy, 35(1):101–110, 2010. doi: 10.1016/j.energy.2009.08.031.
[36] G. Xia, D. Ma, Y. Zhai, Y. Li, R. Liu, and M. Du. Experimental and numerical study of fluid flow and heat transfer characteristics in microchannel heat sink with complex structure. Energy Conversion and Management, 105:848–857, 2015. doi: 10.1016/j.enconman.2015.08.042.
[37] Z. Wan, Q. Lin, X. Wang, and Y. Tang. Flow characteristics and heat transfer performance of half-corrugated microchannels. Applied Thermal Engineering, 123:1140–1151, 2017. doi: 10.1016/j.applthermaleng.2017.05.176.
[38] N. Tokgoz, M.M. Aksoy, and B. Sahin. Investigation of flow characteristics and heat transfer enhancement of corrugated duct geometries. Applied Thermal Engineering, 118:518–530, 2017. doi: 10.1016/j.applthermaleng.2017.03.013.
[39] W. Gao, W. Lin, T. Liu, and C. Xia. Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters. Applied Energy, 84(4):425–441, 2007. doi: 10.1016/j.apenergy.2006.02.005.
[40] T.A. Yassen, N.D. Mokhlif, and M.A. Eleiwi. Performance investigation of an integrated solar water heater with corrugated absorber surface for domestic use. Renewable Energy, vol. 138:852–860, 2019. doi: 10.1016/j.renene.2019.01.114.
[41] K. Tyagi. Detailed Experimental Measurements of Heat Transfer Augmentation in Internal Channels Using a Thermochromic Liquid Crystal Technique. Master Thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA, 2015.
[42] Z. Brodnianska. Experimental investigation of convective heat transfer between corrugated heated surfaces of rectangular channel. Heat Mass Transfer, 55:3151–3164, 2019. doi: 10.1007/s00231-019-02649-3.
[43] M. Khoshvaght-Aliabadi and F. Nozan. Water cooled corrugated minichannel heat sink for electronic devices: Effect of corrugation shape. International Communications in Heat and Mass Transfer, 76:188–196, 2016. doi: 10.1016/j.icheatmasstransfer.2016.05.021.
[44] M.S. Manjunath, K.V. Karanth, and N.Y. Sharma. Numerical investigation on heat transfer enhancement of solar air heater using sinusoidal corrugations on absorber plate. International Journal of Mechanical Sciences, 138-139:219–228, 2018. doi: 10.1016/j.ijmecsci.2018.01.037.
[45] C.-O. Olsson and B. Sunden. Thermal and hydraulic performance of a rectangular duct with multiple V-shaped ribs. Journal of Heat Transfer, 120(4):1072–1077, 1998. doi: 10.1115/1.2825892.
[46] P. Naphon. Heat transfer characteristics and pressure drop in channel with V corrugated upper and lower plates. Energy Conversion and Management, 48(5):1516–1524, 2007. doi: 10.1016/j.enconman.2006.11.020.
[47] C. Zimmerer, P. Gschwind, G. Gaiser, and V. Kottke. Comparison of heat and mass transfer in different heat exchanger geometries with corrugated walls. Experimental Thermal and Fluid Science, 26(2-4):269–273, 2002. doi: 10.1016/S0894-1777(02)00136-X.
[48] H. Pehlivan, I. Taymaz, and Y. İslamoğlu. Experimental study of forced convective heat transfer in a different arranged corrugated channel. International Communications in Heat and Mass Transfer, 46:106–111, 2013. doi: 10.1016/j.icheatmasstransfer.2013.05.016.
[49] K. Sarraf, S. Launay, and L. Tadrist. Complex 3D-flow analysis and corrugation angle effect in plate heat exchangers. International Journal of Thermal Sciences, 94:126–138, 2015. doi: 10.1016/j.ijthermalsci.2015.03.002.
[50] J.E. O’Brien and E. M. Sparrow. Corrugated-duct heat transfer, pressure drop, and flow visualization. Journal of Heat Transfer, 104(3):410–416, 1982. doi: 10.1115/1.3245108.
[51] Y. Islamoglu and C. Parmaksizoglu. The effect of channel height on the enhanced heat transfer characteristics in a corrugated heat exchanger channel. Applied Thermal Engineering, 23(8):979–987, 2003. doi: 10.1016/S1359-4311(03)00029-2.
[52] A.H.H. Ali and Y. Hanaoka. Experimental study on laminar flow forced-convection in a channel with upper V-corrugated plate heated by radiation. International Journal of Heat and Mass Transfer, 45(10):2107–2117, 2002. doi: 10.1016/S0017-9310(01)00309-X.
[53] Y. Qin, X. Guan, Z. Dun, and H. Liu. Numerical simulation on fluid flow and heat transfer in a corrugated plate air preheater. Journal of Chinese Society of Power Engineering, 35:213–218, 2015.
[54] M.A. Mehrabian and R. Poulter. Hydrodynamics and thermal characteristics of corrugated channels: computational approach. Applied Mathematical Modelling, 24(5):343–364, 2000. 10.1016/S0307-904X(99)00039-6.
[55] B.N. Prasad and J.S. Saini. Effect of artificial roughness on heat transfer and friction factor in a solar air heater. Solar Energy, 41(6): 555–560, 1988. 10.1016/0038-092X(88)90058-8.
[56] S. Karsli. Performance analysis of new-design solar air collectors for drying applications. Renewable Energy, 32(10):1645–1660, 2007. 10.1016/j.renene.2006.08.005.
[57] H. Lu, B. Ren, Z. Pu, J. Si, F. Ren, and Y. Du. Simplified calculation of energy efficiency index for plate heat exchanger. IOP Conference Series: Earth and Environment Science, 552:12017, 2020. doi: 10.1088/1755-1315/552/1/012017.
[58] V.S. Hans, R P. Saini, and J.S. Saini. Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with multiple V-ribs. Solar Energy, 84(6):898–911, 2010. doi: 10.1016/j.solener.2010.02.004.
[59] S.K. Saini and R.P. Saini. Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having arc-shaped wire as artificial roughness. Solar Energy, 82(12)1118–1130, 2008. doi: 10.1016/j.solener.2008.05.010.
[60] A. Raheem, W. Siddique, Z.H. Farooqui, T. Salameh, I. Haq, K. Waheed, and K. Qureshi. Performance evaluation of adding helical-screw tape inserts in parabolic solar trough collectors as a source of cleaner energy production. Journal of Cleaner Production, 297:126628, 2021. 10.1016/j.jclepro.2021.126628.
[61] W.H. Hager. Blasius: A life in research and education. Experiments in Fluids, 34(5)566–571, 2003. doi: 10.1007/s00348-002-0582-9.
[62] C.F. Colebrook, T. Blench, H. Chatley, E.H. Essex, J.R.Finniecome, G. Lacey, J. Williamson, and G.G. Macdonald. Turbulent flow in pipes, with particular reference to the transition region between the smooth and rough pipe laws. Journal of the Institution of Civil Engineers, 11(4)133–156, 1939. doi: 10.1680/ijoti.1939.14509.
[63] D. Brkić. Solution of the implicit Colebrook equation for flow friction using Excel. Spreadsheets in Education, 10(2):Art.2, 2017.
[64] T.L. Bergman, A.S. Lavine, F.P. Incropera, and D.P. DeWitt. Fundamentals of Heat and Mass Transfer. John Wiley & Sons, 2011.
[65] H. Hassan, S. Abo-Elfadl, and M.F. El-Dosoky. An experimental investigation of the performance of new design of solar air heater (tubular). Renewable Energy, 151:1055–1066, 2020. doi: 10.1016/j.renene.2019.11.112.
[66] R.J. Moffat. Describing the uncertainties in experimental results. Experimental Thermal and Fluid Science, 1(1):3–17, 1988. doi: 10.1016/0894-1777(88)90043-X.
Go to article

Authors and Affiliations

Waseem Siddique
1
Aneeq Raheem
1
Muhammad Aqeel
2
Sualeh Qayyum
2
Tareq Salamen
3
Khalid Waheed
2
Kamran Qureshi
1

  1. Department of Mechanical Engineering, Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad, Pakistan
  2. Department of Nuclear Engineering, Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad, Pakistan
  3. Sustainable and Renewable Energy Engineering Department, University of Sharjah, United Arab Emirates
Download PDF Download RIS Download Bibtex

Abstract

The Internal Rating Based (IRB) approach requires that financialinstitutions estimate the Loss Given Default (LGD) parameter not only based onclosed defaults but also considering partial recoveries from incomplete workouts.This is one of the key issues in preparing bias-free samples, as there is aneed to estimate the remaining part of the recovery for incomplete defaultsbefore including them in the modeling process. In this paper, a new approachis proposed, where parametric and non-parametric methods are presented toestimate the remaining part of the recovery for incomplete defaults, in pre-defined intervals concerning sample selection bias. Additionally it is shown thatrecoveries are driven by different set of characteristics when default is aging.As an example, a study of major Polish bank is presented, where regressiontree outperforms other methods in the secured products segment, and fractionalregression provides the best results for non-secured ones.

Go to article

Authors and Affiliations

Wojciech Starosta

This page uses 'cookies'. Learn more