Enhancement of heat transfer in a rectangular channel with perforated baffles

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 104 to 105. 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.

[1]  Yaping Chen,et al.  Numerical simulation on flow field in circumferential overlap trisection helical baffle heat exchanger , 2013 .

[2]  Giovanni Tanda,et al.  Heat transfer in rectangular channels with transverse and V-shaped broken ribs , 2004 .

[3]  Saeed Moghaddam,et al.  Impact of micromixing on performance of a membrane-based absorber , 2015 .

[4]  Min Zeng,et al.  Effects of sealing strips on shell-side flow and heat transfer performance of a heat exchanger with helical baffles , 2014 .

[5]  Hossein Afshin,et al.  Experimental investigation of effects of baffle configurations on the performance of a secondary sedimentation tank , 2011 .

[6]  Sunil Chamoli,et al.  Hybrid FAHP (fuzzy analytical hierarchy process)-FTOPSIS (fuzzy technique for order preference by similarity of an ideal solution) approach for performance evaluation of the V down perforated baffle roughened rectangular channel , 2015 .

[7]  Pongjet Promvonge,et al.  Numerical study of laminar flow and heat transfer in square channel with 30° inline angled baffle turbulators , 2010 .

[8]  Sajjad Bigham,et al.  Fluid Flow and Heat Transfer Simulation in a Constricted Microchannel: Effects of Rarefaction, Geometry, and Viscous Dissipation , 2011 .

[9]  Ahmet Tandiroglu,et al.  Effect of flow geometry parameters on transient entropy generation for turbulent flow in circular tube with baffle inserts , 2007 .

[10]  Jianhua Wang,et al.  Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels , 2011 .

[11]  Songlin Liu,et al.  Numerical investigation of heat transfer enhancement in ribbed channel for the first wall of DFLL-TBM in ITER , 2012 .

[12]  Viktor I. Terekhov,et al.  Heat transfer in turbulent separated flow behind a rib on the surface of square channel at different orientation angles relative to flow direction , 2012 .

[13]  Sheng-Chung Tzeng,et al.  Experimental study of fluid flow and heat transfer characteristics in the square channel with a perforation baffle , 2008 .

[14]  Andy Chan,et al.  Large-eddy simulations of particle sedimentation in a longitudinal sedimentation basin of a water treatment plant. Part 2: The effects of baffles , 2009 .

[15]  Sunil Chamoli,et al.  ANN and RSM approach for modeling and optimization of designing parameters for a V down perforated baffle roughened rectangular channel , 2015 .

[16]  Jinhai Zheng,et al.  Effects of perforated baffle on reducing sloshing in rectangular tank: Experimental and numerical study , 2013 .

[17]  Lei Chai,et al.  Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls , 2016 .

[18]  Pongjet Promvonge,et al.  Laminar periodic flow and heat transfer in square channel with 45° inline baffles on two opposite walls , 2010 .

[19]  Saeed Moghaddam,et al.  Direct molecular diffusion and micro-mixing for rapid dewatering of LiBr solution , 2014 .

[20]  Davood Domiri Ganji,et al.  Experimental study on turbulent flow and heat transfer in an air to water heat exchanger using perforated circular-ring , 2016 .

[21]  A. K. M. Sadrul Islam,et al.  MIXED CONVECTION AND ENTROPY GENERATION CHARACTERISTICS INSIDE A POROUS CAVITY WITH VISCOUS DISSIPATION EFFECT , 2009 .

[22]  Pongjet Promvonge,et al.  Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes , 2015 .

[23]  J. Hunt,et al.  Kinematical studies of the flows around free or surface-mounted obstacles; applying topology to flow visualization , 1978, Journal of Fluid Mechanics.

[24]  A. K. M. Sadrul Islam,et al.  Numerical modelling of thermal characteristics in a microstructure filled porous cavity with mixed convection , 2016 .

[25]  M. S. Lee,et al.  The effect of the inclined perforated baffle on heat transfer and flow patterns in the channel , 2012 .

[26]  A. K. M. Sadrul Islam,et al.  EFFECTS OF GEOMETRIC PARAMETERS FOR WAVY FINNED-TUBE HEAT EXCHANGER IN TURBULENT FLOW: A CFD MODELING , 2015 .

[27]  Ahmet Tandiroglu,et al.  Effect of flow geometry parameters on transient heat transfer for turbulent flow in a circular tube with baffle inserts , 2006 .

[28]  A. K. M. Sadrul Islam,et al.  Plate Fin and Tube Heat Exchanger Modeling: Effects of Performance Parameters for Turbulent Flow Regime , 2014 .

[29]  A. K. M. Sadrul Islam,et al.  Numerical Prediction of Laminar Characteristics of Fluid Flow and Heat Transfer in Finned-Tube Heat Exchangers , 2011 .

[30]  Pongjet Promvonge,et al.  Thermal behavior in solar air heater channel fitted with combined rib and delta-winglet ☆ , 2011 .

[31]  Rajendra Karwa,et al.  Heat transfer and friction in an asymmetrically heated rectangular duct with half and fully perforated baffles at different pitches , 2009 .

[32]  Mohammad Ali,et al.  Numerical Investigation of Turbulent Heat Convection from Solid and Longitudinally Perforated Rectangular Fins , 2013 .

[33]  Man-Hoe Kim,et al.  Convective heat transfer enhancement in solar air channels , 2015 .

[34]  Anil Kumar Patil,et al.  Experimental investigation of heat transfer and pressure drop in a circular tube with multiple inserts , 2016 .

[35]  Reza Kamali,et al.  The importance of rib shape effects on the local heat transfer and flow friction characteristics of square ducts with ribbed internal surfaces , 2008 .

[36]  Prashanta Dutta,et al.  Internal cooling augmentation in rectangular channel using two inclined baffles , 2005 .

[37]  Mazlan Abdul Wahid,et al.  Mixed convective nanofluid flow in a channel having backward-facing step with a baffle , 2015 .

[38]  Pongjet Promvonge,et al.  Numerical analysis of laminar heat transfer in a channel with diamond-shaped baffles☆ , 2009 .

[39]  Koichi Nishino,et al.  Heat transfer enhancement accompanying pressure-loss reduction with winglet-type vortex generators for fin-tube heat exchangers. , 2002 .

[40]  Arafat A. Bhuiyan,et al.  NUMERICAL STUDY OF 3D THERMAL AND HYDRAULIC CHARACTERISTICS OF WAVY FIN-AND-TUBE HEAT EXCHANGER , 2012 .

[41]  S. Kwankaomeng,et al.  Laminar periodic flow and heat transfer in square channel with 30° inclined baffles , 2010, Proceedings of the International Conference on Energy and Sustainable Development: Issues and Strategies (ESD 2010).

[42]  Pei-Xue Jiang,et al.  Experimental and numerical investigation of convection heat transfer in a rectangular channel with angled ribs , 2006 .

[43]  Ahmet Tandiroglu,et al.  Energy dissipation analysis of transient heat transfer for turbulent flow in a circular tube with baffle inserts , 2006 .

[44]  Sergio Viçosa Möller,et al.  Numeric and Experimental Analysis of the Turbulent Flow through a Channel With Baffle Plates , 2004 .

[45]  Sajjad Bigham,et al.  Effects of Knudsen number and geometry on gaseous flow and heat transfer in a constricted microchannel , 2011 .

[46]  A. K. M. Sadrul Islam,et al.  Three-dimensional performance analysis of plain fin tube heat exchangers in transitional regime , 2013 .

[47]  Tingting Du,et al.  Parametric optimization of overlapped helical baffled heat exchangers by Taguchi method , 2015 .