Enhancement of heat transfer in a rectangular channel with perforated baffles. (25th May 2016)

• Record Type: Journal Article
• Authors: Sahel, Djamel; Ameur, Houari; Benzeguir, Redouane; Kamla, Youcef
• Is Part Of: Applied thermal engineering. Volume 101(2016:May)
• Page Start: 156
• Page End: 164
• Publication Date: 2016-05-25
• Subjects: Perforated baffle -- Heat transfer -- Turbulent flow -- Numerical analysis -- LHTA; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.02.136
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: The performance of a new baffle design in the channel is numerically investigated. The design concerns a perforated baffle having a row of four holes placed at three different positions. The Reynolds number is ranging from 10 4 to 10 5 . A great enhancement of the heat transfer is obtained with the perforated baffle compared to the simple baffle. Graphical Abstract: Abstract: One problem in using baffles in the channels is the formation of Lower Heat Transfer Areas (LHTA), particularly in the downstream region of baffles (i.e. in baffle-wall corners). The present paper is an investigation of the performance of a new baffle design aiming to enhance the heat transfer phenomenon in the channel. It concerns a perforated baffle having a row of four holes placed at three different positions. These positions are characterized by a ratio called the PAR (Pores Axis Ratio). Three values are taken for the PAR and which are 0.190, 0.425 and 0.660, respectively. The characteristics of fluid flows and heat transfer are presented for Reynolds numbers ranging from 10 4 to 10 5 . All investigations are achieved with the help of the CFD code Fluent. Some numerical results are validated with available experimental data and a satisfactory agreement is found. The obtained results show that the Pores Axis Ratio (PAR) of 0.190 is the best design that eliminates significantly the LHTAs, giving thus an increase in the heat transfer rate from 2% to 65% compared with the simple baffle.