L-Ayaklı Spiral Kanatlı-Boru Demetlerinde Isı Transfer ve Sürtünme Karakteristiklerinin Deneysel İncelenmesi
Bu deneysel çalışmada, L-ayaklı spiral kanatlı boru tipi bir ısı değiştiricinin hava tarafındaki ısı transferi ve akış özellikleri analiz incelenmiştir. Isı değiştiricide hava akışı yönünde dört sıra boru ve her sıradada dört adet boru vardır. Çevre hava borular üzerinden çapraz olarak geçerilirken, sıcak su ise boruların içerisinden geçirilmiştir. Sonuçlar, Reynolds sayısına karşı sürtünme faktörü f ve Colburn j faktörünün grafikleri olarak sunulmuştur. Hava tarafındaki ısı taşınım katsayısı ve basınç düşüşünün de hava hızına karşı değişimi gösterilmiştir. Bunlara ek olarak, j ve f faktörlerinin korelasyonları da deneysel verilerden elde edilmiştir.
Experimental Investigation of Heat Transfer and Friction Characteristics in L-Footed Spiral Fin-Tube Banks
In this experimental study, air side heat transfer and flow characteristics of L-footed spiral fin-and-tube heat exchanger have beenanalyzed. There were four rows of tubes in the air flow direction and four tubes per row in the heat exchanger. The hot water was flowedthrough the tubes while the ambient air was flowed cross flow over the tubes. The results were presented as plots of friction factor fand Colburn j factor against Reynolds number. The air-side heat transfer coefficient and pressure drop were also presented againstfrontal air velocity. Additionally, The correlations for j and f factors were also obtained from the experimental data.
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- 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.
- 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.
- 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.
- Kırtepe E. 2014. Kanatli Dairesel Borularda Isı Transfer
Etkinliğinin İncelenmesi. Ege Üniversitesi, Fen Bilimleri
Enstitüsü, 111p, (In Turkish).
- 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.
- Kraus A.D., Aziz A., Welty J. 2001. Extended Surface Heat
Transfer. John Wiley & Sons, New York.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- Shah R.K., and Sekulic D.P. 2003. Fundamentals of Heat
Exchanger Design. John Wiley & Sons, Canada.
- Tang L.H., Zeng M., Wang Q.W. 2009. Experimental and
numerical investigation on air-side performance of fin-andtube
heat exchangers with various fin patterns. Experimental
Thermal and Fluid Science 33, 818-827.
- 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.