L-Ayaklı Spiral Kanatlı-Boru Demetlerinde Isı Transfer ve Sürtünme Karakteristiklerinin Deneysel İncelenmesi

Öz

In this experimental study, air side heat transfer and flow characteristics of L-footed spiral fin-and-tube heat exchanger have been analyzed. There were four rows of tubes in the air flow direction and four tubes per row in the heat exchanger. The hot water was flowed through the tubes while the ambient air was flowed cross flow over the tubes. The results were presented as plots of friction factor f  and  Colburn j factor against Reynolds number. The air-side heat transfer coefficient and pressure drop were also presented against frontal air velocity. Additionally, The correlations for j and f factors were also obtained from the experimental data.       

Anahtar Kelimeler

• L-footed spiral fin,Heat exchanger,Extended surface,Heat transfer

Experimental Investigation of Heat Transfer and Friction Characteristics in L-Footed Spiral Fin-Tube Banks

Abstract

In this experimental study, air side heat transfer and flow characteristics of L-footed spiral fin-and-tube heat exchanger have been analyzed. There were four rows of tubes in the air flow direction and four tubes per row in the heat exchanger. The hot water was flowed through the tubes while the ambient air was flowed cross flow over the tubes. The results were presented as plots of friction factor f and Colburn j factor against Reynolds number. The air-side heat transfer coefficient and pressure drop were also presented against frontal air velocity. Additionally, The correlations for j and f factors were also obtained from the experimental data. 

Keywords

• L-footed spiral fin,Heat exchanger,Extended surface,Heat transfer

References

1. FaJiang H., WeiWu C., Ping Y. 2012. Experimental investigation of heat transfer and flowing resistance for air flow cross over spiral finned tube heat exchanger. Energy Procedia 17, 741-749.
2. Kawaguchi K., Okui K., Asai T., Hasegawa Y. 2006a. The Heat Transfer and Pressure Drop Characteristics of the Finned Tube Banks in Forced Convection (Effects of Fin Height on Heat Transfer Characteristics). Heat Transfer-Asian Research 35, 194-208.
3. Kawaguchi K., Okui K., Asai T., Hasegawa Y. 2006b. The Heat Transfer and Pressure Drop Characteristics of Finned Tube Banks in Forced Convection (Effects of Fin Height on Pressure Drop Characteristics). Heat Transfer-Asian Research 35, 179-193.
4. Kırtepe E. 2014. Kanatli Dairesel Borularda Isı Transfer Etkinliğinin İncelenmesi. Ege Üniversitesi, Fen Bilimleri Enstitüsü, 111p, (In Turkish).
5. Kiatpachai P., Pikulkajorn S., Wongwises S. 2015. Air-side performance of serrated welded spiral fin-and-tube heat exchangers. International Journal of Heat and Mass Transfer 89, 724-732.
6. Kraus A.D., Aziz A., Welty J. 2001. Extended Surface Heat Transfer. John Wiley & Sons, New York.
7. Lee M., Taehyung K., Kim Y. 2009. Air-side heat transfer characteristics of spiral-type circular fin-tube heat exchangers. International Journal of Refrigeration 33, 313-320.
8. Ma Y., Yuan Y., Liu Y., Hu X., Huang Y. 2012. Experimental investigation of heat transfer and pressure drop in serrated finned tube banks with staggered layouts. Applied Thermal Engineering 37, 314-323.

9. Nuntaphan A., Kiatsiriroat T., Wang C.C. 2005a. Air side performance at low Reynolds number of cross-flow heat exchanger using crimped spiral fins. International Communications in Heat and Mass Transfer 32, 151-165.
10. Nuntaphan A., Kiatsiriroat T., Wang C.C. 2005b. Heat transfer and friction characteristics of crimped spiral finned heat exchangers with dehumidification. Applied Thermal Engineering 25, 327-340.
11. Pongsoi P., Pikulkajorn S., Wang C.C., Wongwises S. 2011. Effect of fin pitches on the air-side performance of crimped spiral fin-and-tube heat exchangers with a multipass parallel and counter cross-flow configuration. International Journal of Heat and Mass Transfer 54, 2234-2240.
12. Pongsoi P., Pikulkajorn S., Wang C.C., Wongwises S. 2012a. Effect of number of tube rows on the air-side performance of crimped spiral fin-and-tube heat exchanger with a multipass parallel and counter cross-flow configuration. International Journal of Heat and Mass Transfer 55, 1403-1411.
13. Pongsoi P., Pikulkajorn S., Wongwises S. 2012b. Experimental study on the air-side performance of a multipass parallel and counter cross-flow L-footed spiral fin-and-tube heat exchanger. Heat Transfer Engineering 33, 1251-1263.
14. Pongsoi P., Promoppatum P., Pikulkajorn S., Wongwises S. 2013. Effect of fin pitches on the air-side performance of L-footed spiral fin-and-tube heat exchangers. International Journal of Heat and Mass Transfer 59, 75-82.
15. Shah R.K., and Sekulic D.P. 2003. Fundamentals of Heat Exchanger Design. John Wiley & Sons, Canada.
16. Tang L.H., Zeng M., Wang Q.W. 2009. Experimental and numerical investigation on air-side performance of fin-and-tube heat exchangers with various fin patterns. Experimental Thermal and Fluid Science 33, 818-827.
17. Wang C.C., Chang Y.J., Hsieh Y.C., Lin Y.T. 1996. Sensible Heat and Friction Characteristics of Plate Fin and-Tube Heat Exchangers Having Plane Fins. International Journal of Refrigeration 19, 223–230.