Effect of Using Combined Square Nozzle & winglet with Helical Tape on Thermal Characteristics in Tube Heat Exchanger

Main Article Content

Hisham Assi Hoshi Israa S. Ahmed Abdulmunem R. Abdulmunem

Abstract

Influence of combined square nozzle with helical tape inserted in a constant heat flux tube on heat transfer enhancement for turbulent airflow for Reynolds number ranging from 7000 to 14500 were investigated experimentally. Three different pitch ratios for square nozzle (PR = 5.8, 7.7 and 11.6) according to three different numbers of square nozzle (N = 3, 4 and 5) and constant pitch ratios for helical tape were used. The results observed that the Nusselt number and friction factor for combination with winglets were found to be up to 33.8 % and 21.4 %, respectively higher than nozzle alone for pitch ratio PR=5.8. The maximum value of thermal performance for using combination with winglets was about 1.351 for pitch ratio= 5.8. Nusselt number and friction factor correlations from experimental data were developed for turbulent flow.

Article Details

How to Cite
HOSHI, Hisham Assi; AHMED, Israa S.; ABDULMUNEM, Abdulmunem R.. Effect of Using Combined Square Nozzle & winglet with Helical Tape on Thermal Characteristics in Tube Heat Exchanger. Al-Khwarizmi Engineering Journal, [S.l.], v. 14, n. 4, p. 64- 71, nov. 2018. ISSN 2312-0789. Available at: <http://alkej.com/index.php/en/article/view/741>. Date accessed: 12 dec. 2018.
Section
Articles

References

[1] S. Eiamsa-ard, K.Wongcharee, P.Eiamsa-ard,C.Thianpong, Heat transfer enhancement in a tube using delta-winglet twisted tape inserts, Applied Thermal Engineering 30 (2010) 310–318
[2] S.W. Chang, K.W. Yu, M.H. Lu, Heat transfer in tubes fitted with single, twin and triple twisted tapes, J. Exp. Heat Transfer 18 (2005) 279–294.
[3] Peng L, Nianben Z, Feng S, Zhichun L, Wei L, an experimental and numerical study on the laminar heat transfer and flow characteristics of a circular tube fitted with multiple conical strips, Int. J of Heat and Mass Transfer 117 (2018) 691–709.
[4] L.Wang, B. Sunden, Performance comparison of some tube inserts, Int. Commun. Heat Mass Transfer 29 (2002) 45–56.
[5] Khalid M. S, Ali I. S, Ahmed A. T, Mohamed M. A E, CFD modelling of entropy generation in turbulent pipe flow: Effects of temperature difference and swirl intensityApplied Thermal Engineering 100 (2016) 999–1006
[6] S.W. Chang, Y. Zheng, Enhanced heat transfer with swirl duct under rolling and pitching environment, J. Ship Res. 46 (2002) 149–166.
[7] Chou X. T, Wai L. M., Yew M. H.,Boon Th. T, The role of inserts in forced convection heat transfer augmentation, Int.Commun. Heat and Mass Transfer 39 (2012) 1138–1145.
[8] Eimsa-ard S, Thianpong C, Promvonge P. Experimental investigation of heat transfer and flow friction in a circular tube fitted with regularly spaced twisted tape elements. IntCommun Heat Mass Transfer 2006;33: 1225–33.
[9] M.M.K. Bhuiyaa, J.U. Ahamed, M.S.U. Chowdhury, M.A.R. Sarkar, B. Salam, R. Saidur, H.H. Masjuki, M.A. Kalam, Heat transfer enhancement and development of correlation for turbulentflow through a tube with triple helical tape inserts.Int.Commun. in Heat and Mass Transfer 39 (2012) 94–101
[10] Veysel O, Sibel G, Orhan B, Necdet A, Heat transfer enhancement in a tube using circular cross sectional rings separated from wall. Applied Energy 85 (2008) 988–1001.
[11] X. Zhang, Z. Liu, W. Liu, Numerical studies on heat transfer andflowcharac- teristics for laminar flow in a tube with multiple regularly spaced twistedtapes, Int. J. Therm. Sci. 58 (2012) 157-167
[12] Pongjet P, Somsak P, Monsak P, Chinaruk T, Heat transfer augmentation in a helical-ribbed tube with double twisted tape inserts Int.Commun.in Heat and Mass Transfer 39 (2012) 953–959.
[13] Sombat T, Yingyong K, Sompol S, Pongjet P, Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes.Thermal Engineering 7 (2016) 14–24
[14] F.P. Incropera, P.D. Witt, T.L. Bergman, A.S. Lavine, Fundamentals of Heat and Mass Transfer, John-Wiley & Sons, 2006.