Konik saptýrýcýlý ýsýtýcý borunun etkinliðinin deneysel araþtýrýlmasý

Bu çalýþmada, konik saptýrýcýlý ýsýtýcý borunun farklý eðim açýlarý için etkinlikleri deneysel olarak araþtýrýlmýþtýr. Eðilmiþ konik saptýrýcýlar vasýtasýyla daha büyük vorteks akýþlar saðlanarak ýsý transferi artýþý saðlanmýþ ve etkinlik bakýmýndan en iyi eðim açýsý belirlenmiþtir. Deneyler, üç farklý eðim açýsý (45°, 60° ve 80°) için gerçekleþtirilmiþtir. Çalýþmada, ýsýtýlan akýþkan olarak hava, ýsýtýcý akýþkan olarak ise su kullanýlmýþtýr. Isýtýcý su sýcaklýðý, 65 °C’da sabit tutulmuþtur. 2-20 m/s arasýnda sekiz farklý hava akýþ hýzý için deneysel sonuçlar elde edilmiþtir. NTU>1 için elde edilen sonuçlar, 45° ve 80°’nin etkinliðinin, 60°’ile karþýlaþtýrýldýðýnda daha büyük olduðu gösterilmiþtir. Buna ek olarak, NTU<1 için ise üç açýnýn etkinlik deðerlerinin birbirine yakýn olduðu bulunmuþtur.

Experimental investigation of effectiveness of heating tube with conical baffles

In this paper, effectiveness of heated tube with conical baffles was studied experimentally as a function of various inclination angles. By using inclined conical baffles vortex of the flow was increased thereby giving rise to heat transfer and the best inclination angle was determined. Experiments were performed for three different inclination angles (45°, 60° ve 80°). Water as hot fluid and air as cold fluid were used as working fluids in the experiments. Water temperature was fixed as 65 °C. Air flow velocities were taken at 8 distinct levels between 2-20 m/s. The results indicated that for NTU>1, 45° and 80° were more effective compared to 60°. In addition for NTU<1, all three angles were found to be similarly effective.