Experimental investigation of the effect of wave turbulators on heat transfer in pipes


Karagöz Ş., Kaya M.

Thermal Science, no.0, pp.183, 2021 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Publication Date: 2021
  • Doi Number: 10.2298/tsci210206183k
  • Title of Journal : Thermal Science
  • Page Numbers: pp.183

Abstract

This experimental study deals with the heat transfer and friction effects of
sinusoidal part turbulators for single-phase flows occurring in a circular
shaped pipe. Turbulators with three different radius values are placed in the
pipe to make the flow turbulent. In this way, changes in Nusselt number and
friction coefficient are examined. As a result of the experiments made with
Reynolds numbers in the range of 6614-20710, the increase rates of the
Nusselt numbers of turbulators with 20 mm, 110 mm and 220 mm radius
compared to the empty pipe were obtained as 153.49%, 85.36%, and
52.09%, respectively. As a result of the decrease in the radius, there was an
increase in the Nusselt number and the friction factor. Parallel to the Nusselt
number, the highest friction factor was obtained in the smallest radius
turbulator. It was found that the thermal enhancement factors of 110 mm
and 220 mm radius turbulators increased by 179.54% and 132.95%,
respectively, compared to the 20 mm radius turbulator. Similarly, it was
determined that the thermal enhancement factor of the 110 mm radius

turbulator increased by 20% compared to the 220 mm radius turbulator.

This experimental study deals with the heat transfer and friction effects of
sinusoidal part turbulators for single-phase flows occurring in a circular
shaped pipe. Turbulators with three different radius values are placed in the
pipe to make the flow turbulent. In this way, changes in Nusselt number and
friction coefficient are examined. As a result of the experiments made with
Reynolds numbers in the range of 6614-20710, the increase rates of the
Nusselt numbers of turbulators with 20 mm, 110 mm and 220 mm radius
compared to the empty pipe were obtained as 153.49%, 85.36%, and
52.09%, respectively. As a result of the decrease in the radius, there was an
increase in the Nusselt number and the friction factor. Parallel to the Nusselt
number, the highest friction factor was obtained in the smallest radius
turbulator. It was found that the thermal enhancement factors of 110 mm
and 220 mm radius turbulators increased by 179.54% and 132.95%,
respectively, compared to the 20 mm radius turbulator. Similarly, it was
determined that the thermal enhancement factor of the 110 mm radius

turbulator increased by 20% compared to the 220 mm radius turbulator.