scholarly journals Heat Transfer and Friction Characteristics of Turbulent Flow through a Circular Tube with Ball Turbulators

2018 ◽  
Vol 8 (5) ◽  
pp. 776 ◽  
Author(s):  
Wei Yuan ◽  
Guoyun Fang ◽  
Xiaoqing Zhang ◽  
Yong Tang ◽  
Zhenping Wan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Circular Tube ◽  
Friction Characteristics ◽  
Flow Through

Enhancement and Prediction of Heat Transfer Rate in Turbulent Flow Through Tube With Perforated Twisted Tape Inserts: A New Correlation

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
J. U. Ahamed ◽  
M. A. Wazed ◽  
S. Ahmed ◽  
Y. Nukman ◽  
T. M. Y. S. Tuan Ya ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Turbulent Flow ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Circular Tube ◽  
Twisted Tape ◽  
Pumping Power ◽  
Plain Tube ◽  
Flow Through

An experimental investigation has been carried out for turbulent flow in a tube with perforated twisted tape inserts. The mild steel twisted tape inserts with circular holes of different diameters (i.e., perforation) are used in the flow field. An intensive laboratory study is conducted for heat transfer and pressure drop characteristics in the tubes for turbulent flow with various airflow rates. Heat transfer and pressure drop data are engendered for a wide range Reynolds number (1.3×104–5.2×104). Tube wall temperature, pressure drop, air velocity, and its temperature are measured both for plain tube and for tube with perforated twisted tape inserts. Heat transfer coefficients, Nusselt number, pumping power, and heat transfer effectiveness are calculated for both cases. Experimental results showed that perforated twisted inserts of different geometry in a circular tube enhanced the heat transfer rate with an increase in friction factor and pumping power for turbulent flow. The pumping power, heat transfer coefficient, and effectiveness in the tube with the twisted tape inserts are found to increase up to 1.8, 5.5, and 4.0 times of those for the plain tube for same Reynolds number, respectively. Finally, a correlation is developed for prediction of the heat transfer rate for turbulent flow through a circular tube with perforated twisted tape inserts.

Heat transfer and friction characteristics of turbulent flow through plain tube inserted with rotor-assembled strands

2012 ◽  
Vol 38 ◽  
pp. 33-39 ◽  
Author(s):  
Zhen Zhang ◽  
Weimin Yang ◽  
Changfeng Guan ◽  
Yumei Ding ◽  
Fengxiang Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Friction Characteristics ◽  
Plain Tube ◽  
Flow Through
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