TY  - JOUR
T1  - Enhancement of heat transfer using twisted tape insert in a plain tube
TT  - Düz tüp içerisinde burulmuş şerit kullanarak ısı geçişinin iyileştirilmesi
AU  - Yılmaz, İbrahim Halil
AU  - Göksu, Taha Tuna
PY  - 2019
DA  - March
Y2  - 2019
DO  - 10.17798/bitlisfen.462169
JF  - Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
PB  - Bitlis Eren University
WT  - DergiPark
SN  - 2147-3129
SP  - 251
EP  - 260
VL  - 8
IS  - 1
LA  - en
AB  - The use of insertwithin a tube is one of the techniques enhancing the convective heat transfercoefficient at the expense of hydraulic loss penalty. This mutual effect whichis a strong function of insert geometry and flow conditions is to be analyzedin detail to improve the overall system performance. This study presents a numerical investigation foranalyzing the thermo-hydraulic characteristics of twisted tape insert in aplain tube (with a 13-mm-diameter and 1200-mm-long) which is widely used inrefrigeration applications where the compactness of heating/cooling element is significant.The effect of twist ratio on the thermo-hydraulic performance was conducted forthe Reynolds number range of 5,025−14,871 where most of refrigeration applicationsare operated in. The verification of the simulation results was compared to Dittus-Boelterempirical equation (for the plain tube case) and good agreement was obtained. Resultsindicate that the variation of the twist ratio between 6−9 increases thefriction factor and Nusselt number 197−245%, 180−220%, 163−189% and 156−179%,and 32−54%, 28−46%, 28−33% and 28−33% relative to the plain tube case,respectively for the specified operating conditions. The performance evaluationcriteria, which are measure of enhancing heat transfer against hydrodynamicforces, changed between 0.90−1.02, 0.89−1.00, 0.91−0.96 and 0.92−0.96 based onthe twist ratio rise. The maximum enhancement in the performance evaluation criteriawas obtained at the lowest Reynolds number and twist ratio. The performance evaluationcriteria lower with increasing Reynolds number but can be increased by increasingthe twist ratio.
KW  - Heat transfer enhancement
KW  - Twisted tape
KW  - Twist ratio
KW  - Performance evaluation criteria
N2  - Tüp içerisinde ilave parça kullanımı, hidrolik kayıp zafiyetipahasına taşınım ısı geçişi katsayısını arttırmak için kullanılan tekniklerdenbiridir. İlave parça geometrisinin ve akış koşullarının güçlü bir işlevi olan bumüşterek etki, toplam sistem performansını iyileştirmek için ayrıntılı şekildeanaliz edilmelidir. Bu çalışma, ısıtma/soğutma elemanı kompaktlığının önemliolduğu soğutma uygulamalarında sıkça kullanılan düz tüpe (13 mm çaplı ve 1200mm uzunluğunda) burulmuş şerit ilavesi akabinde termo-hidrolik özelliklerininanalizi için sayısal bir araştırma sunmaktadır. Burma oranının termo-hidrolikperformans üzerindeki etkisi, soğutma uygulamalarının genelinin çalıştığı 5.025−14.871Reynolds sayısı aralığında incelenmiştir. Benzetim sonuçlarının doğrulanması deneyedayalı Dittus-Boelter denklemi ile karşılaştırılmış (düz tüp için) ve iyi bir uyumelde edilmiştir. Sonuçlar, 6−9 arası burma oranındaki değişimin belirtilençalışma koşullarında düz tüpe göre sürtünme faktörünü ve Nusselt sayısınısırasıyla %197−245, %180−220, %163−189 ve %156−179 ve %32−54, %28−46, %28−33 ve%28−33 arttırdığını göstermektedir. Hidrodinamik kuvvetlere karşı ısı geçişmiktarının artırılmasının ölçütü olan performans değerlendirme ölçütü, burmaoranı artışına bağlı olarak 0.90−1.02, 0.89−1.00, 0.91−0.96 ve 0.92−0.96 arasındadeğişmiştir. Performans değerlendirme ölçütündeki maksimum artış, en düşükReynolds sayısı ve burma oranında elde edilmiştir. Performans değerlendirmeölçütü Reynolds sayısının artışıyla azalmakta ancak burma oranı arttırılarak yükseltilebilmektedir.
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UR  - https://doi.org/10.17798/bitlisfen.462169
L1  - https://dergipark.org.tr/en/download/article-file/668507
ER  -