EFFECT OF NEW TURBULATORS ON HEAT TRANSFER COEFFICIENT AND PRESSURE DROP IN A WATER HEAT EXCHANGER


Fırat İ.

ICHEAS 8. ULUSLARARASI SAĞLIK, MÜHENDİSLİK VE UYGULAMALI BİLİMLER KONGRESİ, 15 - 17 November 2024, pp.1-11

  • Publication Type: Conference Paper / Full Text
  • Page Numbers: pp.1-11
  • Erzincan Binali Yildirim University Affiliated: Yes

Abstract

The improvement of heat exchanger performance and efficiency has led researchers to adopt various approaches to improve heat transfer. Turbulators represent a widely used technique to create turbulent motion and increase heat transfer. The use of different fluid types is another method that mainly aims to improve the conductivity of the working fluid. Recently, many studies have focused on improving heat exchanger performance by combining two methods, namely fluids and turbulators. In the present study, the effects of V-shaped turbulators with a step ratio P=1.5 placed in a circular analysis pipe under turbulent flow conditions to improve heat exchanger performance using water fluid on heat transfer coefficient and pressure drop were numerically investigated. Analyses were carried out at six different Reynolds numbers under turbulent flow conditions. The results of the empty pipe analysis were compared with the correlations accepted in the literature. According to the obtained results, the maximum error margins of the heat transfer and friction factor values ​​of the empty pipe according to Gnielinski and Blasius correlations were obtained as 3.47% and 13.61%, respectively. It was concluded that the heat transfer coefficient and pressure drop were higher in the turbulated pipe compared to the empty pipe. Thanks to the turbulators in the pipe, the fluid was distributed from the pipe center to the walls. Thus, the contact between the fluid and the pipe wall was increased. Therefore, the heat transfer was increased due to the turbulators. In addition, a pressure difference occurred between the pipe inlet and outlet. Depending on the increasing Re number, both the heat transfer coefficient and the pressure drop increased. In general, the V-shaped turbulated pipe provided higher heat transfer coefficient increases between 6.42% and 8.59% and higher pressure drops between 86.51% and 87.70% compared to the empty pipe for all Reynolds numbers, depending on the P=1.5 step ratio value used.