Investigation of nanofluids on heat transfer enhancement in a louvered microchannel with lattice Boltzmann method

Numerical studies of laminar forced convective heat transfer and fluid flow in a 2D louvered microchannel with Al2O3/water nanofluids are performed by the lattice Boltzmann method (LBM). Eight louvers are arranged in tandem within the single-pass microchannel. The Reynolds number based on channel hydraulic diameter and bulk mean velocity ranges from 100 to 400, where the Al2O3 fraction varies from 0 to 4%. A double distribution function approach is adopted for modeling fluid flow and heat transfer. Code validations are performed by comparing the streamwise Nusselt number (Nu) profiles and Fanning friction factors of the present LBM and those of the analytical solutions. Good agreements are obtained. Simulated results show that the louver microstructure can disturb the core flow and guide coolant toward the heated walls, thus enhancing the heat transfer significantly. Furthermore, the addition of nanoparticles in microchannels can also augment the heat transfer, but it creates an unnoticeable pressure loss. With both the louver microstructure and nanofluid, a maximum overall Nu enhancement of 7.06 is found relative to that of the fully developed smooth channel.

[1]  M. M. Rahman,et al.  HEAT TRANSFER IN A MICROTUBE OR MICROCHANNEL WITH PROTRUSIONS , 2011 .

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

[3]  A. Mujumdar,et al.  Heat transfer characteristics of nanofluids: a review , 2007 .

[4]  R. Pease,et al.  High-performance heat sinking for VLSI , 1981, IEEE Electron Device Letters.

[5]  C. T. Nguyen,et al.  Temperature and particle-size dependent viscosity data for water-based nanofluids : Hysteresis phenomenon , 2007 .

[6]  Q. Zou,et al.  On pressure and velocity boundary conditions for the lattice Boltzmann BGK model , 1995, comp-gas/9611001.

[7]  B. W. Webb,et al.  Conjugate heat transfer in a channel with staggered ribs , 1985 .

[8]  Cheng Chin-Hsiang,et al.  Numerical prediction for laminar forced convection in parallel-plate channels with transverse fin arrays , 1991 .

[9]  E. Roohi,et al.  Numerical study of liquid flow and heat transfer in rectangular microchannel with longitudinal vortex generators , 2015, 1811.02823.

[10]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[11]  Junming Li,et al.  Experimental viscosity measurements for copper oxide nanoparticle suspensions , 2002 .

[12]  Frank P. Incropera,et al.  Liquid Cooling of Electronic Devices by Single-Phase Convection , 1999 .

[13]  Yue-Tzu Yang,et al.  Numerical study of flow and heat transfer characteristics of alumina-water nanofluids in a microchannel using the lattice Boltzmann method , 2011 .

[14]  Rahman Saidur,et al.  A REVIEW ON APPLICATIONS AND CHALLENGES OF NANOFLUIDS , 2011 .

[15]  A. Bejan.  Convection Heat Transfer: Bejan/Convection Heat Transfer 4e , 2013 .

[16]  E. Sparrow,et al.  Fully Developed Flow and Heat Transfer in Ducts Having Streamwise-Periodic Variations of Cross-Sectional Area , 1977 .

[17]  S. Patankar,et al.  Numerical Prediction of Flow and Heat Transfer in a Parallel Plate Channel With Staggered Fins , 1987 .

[18]  Omid Ali Akbari,et al.  Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel , 2016, Appl. Math. Comput..

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

[20]  N. Galanis,et al.  Heat transfer enhancement by using nanofluids in forced convection flows , 2005 .

[21]  A. Bejan.  Convection Heat Transfer , 1984 .

[22]  C. Chon,et al.  Empirical correlation finding the role of temperature and particle size for nanofluid (Al2O3) thermal conductivity enhancement , 2005 .

[23]  Philippe Marty,et al.  Numerical prediction of heat transfer and pressure drop in three-dimensional channels with alternated opposed ribs , 2012 .

[24]  Yang Liu,et al.  Effect of Surface Microstructure on Microchannel Heat Transfer Performance , 2011 .

[25]  T. Liou,et al.  Large eddy simulation of rotating turbulent flows and heat transfer by the lattice Boltzmann method , 2018 .

[26]  C. T. Nguyen,et al.  New temperature dependent thermal conductivity data for water-based nanofluids , 2009 .

[27]  A. Abdel-azim.  Fundamentals of Heat and Mass Transfer , 2011 .

[28]  Kamel Hooman,et al.  Heat and fluid flow in entrance region of a channel with staggered baffles , 2006 .

[29]  Shiping Jin,et al.  Experimental investigations on liquid flow and heat transfer in rectangular microchannel with longitudinal vortex generators , 2011 .

[30]  Qisu Zou,et al.  N ov 1 99 6 On pressure and velocity flow boundary conditions and bounceback for the lattice Boltzmann BGK model , 2008 .

[31]  Y. Qian,et al.  Lattice BGK Models for Navier-Stokes Equation , 1992 .

[32]  Stephen U. S. Choi.  Enhancing thermal conductivity of fluids with nano-particles , 1995 .

[33]  Gilles Roy,et al.  Experimental investigation of nanofluids in confined laminar radial flows , 2009 .

[34]  C. Nonino,et al.  Three-dimensional roughness effect on microchannel heat transfer and pressure drop , 2007 .

[35]  Yogendra Joshi,et al.  PARAMETRIC NUMERICAL STUDY OF FLOW AND HEAT TRANSFER IN MICROCHANNELS WITH WAVY WALLS , 2011 .

[36]  R. Thundil Karuppa Raj,et al.  Influence of aspect ratio on the thermal performance of rectangular shaped micro channel heat sink using CFD code , 2017 .

[37]  M. Haghshenasfard,et al.  Investigation of nanofluids heat transfer in a ribbed microchannel heat sink using single-phase and multiphase CFD models , 2015 .

[38]  P. Lee,et al.  Developing forced convection in converging–diverging microchannels , 2013 .

[39]  Renato Machado Cotta,et al.  Thermally developing laminar flow inside rectangular ducts , 1990 .