Experimental Research on Pressure Drop to Optimize Twisted Strips with Holes in Tubes of Condensers

Abstract:

In order to reduce the pressure drop increase caused by self-rotating plastic twisted-strips in heat transfer tubes of vacuum condensers in thermal power plant, the twisted strips structure is optimized. There are holes distributed in twisted strip uniformly. The holes diameter and interval are optimized through experimental research. The results show that when holes diameter is less than 6mm, holes can reduce the pressure drop increase at low flow velocity while the pressure drop with holes is greater than that without holes at high flow velocity. The holes diameter is 4~5mm when the pressure drop is the lowest. The pressure drop with holes is always larger than that without holes when holes diameter is more than 6mm. The pressure drop will increase as holes interval decreases at high flow velocity, while it will reduce at low flow velocity.

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 448-452
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.448
• Online since: October 2011
• Authors: De Qi Peng, Ya Jie Zhou, Wei Qiang Wang, Tian Lan Yu, Huan Yu, Jian Ye Yi
• Keywords: Fouling Removal, Pressure Drop, Twisted Strip, Vacuum Condenser

References

[1] M. Markowski， K. Urbaniec，Optimal Cleaning Schedule for Heat Exchangers in a Heat Exchanger Network.Applied Thermal Engineering 25(7) (2005) 1019-1032.

DOI: 10.1016/j.applthermaleng.2004.06.025

[2] Tianlan Yu，Deqi Peng，Guiying Liu，Shaoqing Jiang，Xiaoheng Zhi，Xiuming Yu，Xianghong Yang，Online continuous cleaning foul and anti-foul technology of self-rotating plastic twisted strips for condensers equipped on steam turbines .Modern Chemical Industry 22(6) (2002) 46-48.

[3] R.M. Manglik A.E. Bergles，Heat Transfer and Pressure Drop Correlations for Twisted Strip Inserts in Isothermal Tubes:Part Ⅱ-Transition and Turbulent Flows.ASME J. Heat Transfer 115 (1993) 890-896.

DOI: 10.1115/1.2911384

[4] P.Sivashanmugam,S Suresh，Experimental Studies on Heat Transfer and Friction Factor Characteristics of Laminar Flow through a Circular Tube Fitted with Regularly Spaced Helical Screw-Strip Inserts.Experimental Thermal and Fluid Science 31(4) (2007) 301-308.

DOI: 10.1016/j.expthermflusci.2006.05.005

[5] S.W. Chang T.L. Yang J.S. Liou，Heat Transfer and Pressure Drop in Tube with Broken Twisted Strip Insert.Experimental Thermal and Fluid Science 32 (2007) 489-501.

DOI: 10.1016/j.expthermflusci.2007.06.002

[6] P.Sivashanmugam,S.Suresh，Experimental Studies on Heat Transfer and Friction Factor Characteristics of Turbulent Flow through a Circular Tube Fitted with Regularly Spaced Helical Screw-Strip Inserts.Applied Thermal Engineering 27(8-9) (2007) 1311–1319.

DOI: 10.1016/j.applthermaleng.2006.10.035

[7] S.K. Saha,A.Dutta S.K. Dhal，Friction and Heat Transfer Characteristics of Laminar Swirl Flow through a Circular Tube Fitted with Regularly Spaced Twisted-Strip Elements.International Journal of Heat and Mass Transfer 44(22) (2001) 4211-4223.

DOI: 10.1016/s0017-9310(01)00077-1

[8] S.W. Chang K.W.Yu,M.H.Lu，Heat Transfer in Tubes Fitted with Single,Twin and Triple Twisted Strips. J.Exp.Heat Transfer18 (2005) 279-294.

DOI: 10.1080/08916150500201560

[9] S.W. Chang Y.J. Jan J.S. Liou，Turbulent Heat Transfer and Pressure Drop in Tube Fitted serrated Twisted-Strip.Int.J.Therm.Sci. 46 (2007) 506-518.

DOI: 10.1016/j.ijthermalsci.2006.07.009

[10] Defan Qing，Li Zhou，Tianlan Yu，Deqi Peng , Xiuming Yu， Investigation on effects of automatic cleaning twisted stripe on fluid resistance in fouling condenser in power plant .MECHANICAL RESEARCH & APPLICATION 14（2）(2001) 3-4.