Heat transfer enhancement in a counter-flow sinusoidal parallel-plate heat exchanger partially filled with porous media
- PDF / 2,227,885 Bytes
- 17 Pages / 595.276 x 790.866 pts Page_size
- 102 Downloads / 269 Views
(0123456789().,-volV)(0123456789().,-volV)
Heat transfer enhancement in a counter-flow sinusoidal parallel-plate heat exchanger partially filled with porous media using metal foam in the channels’ divergent sections Hossein Arasteh1 • Ramin Mashayekhi2 • Milad Ghaneifar3 • Davood Toghraie4 • Masoud Afrand5,6 Received: 3 July 2019 / Accepted: 27 September 2019 Akade´miai Kiado´, Budapest, Hungary 2019
Abstract This is a numerical study of heat transfer and flow in a counter-flow sinusoidal parallel-plate heat exchanger using metal foam in the channels’ divergent sections. The cold water fluid with Reynolds number of 100 and hot oil fluid with Reynolds number of 2 enter the downer and upper channels of the heat exchanger, respectively. The sinusoidal heat exchanger is investigated with two-wave amplitudes (0.3 and 0.6 cm), two wavelengths (6 and 12 cm) inserting the porous media with three particle diameters (0.1, 0.05 and 0.01 mm) and three thicknesses (A/3, 2A/3, and A). Darcy–Brinkman–Forchheimer and local thermal non-equilibrium models are used. To evaluate the increased heat transfer versus the increased pumping power, a dimensionless number called performance evaluation criteria (PEC) has been defined in the current study. The obtained results showed that the heat transfer rate, effectiveness and overall heat transfer coefficient of the heat exchanger are increased up to 19.2%, and the PEC number is enhanced to 1.171 in the optimum case with wave amplitude, wavelength, metal foam particle diameter and thickness equal to 0.6 cm, 6 cm, 0.01 mm and 2A/3, respectively. Moreover, since the metal foam is embedded in the wake region of the heat exchanger or channels’ divergent sections, its effect on pumping power is subtle, which is an advantage of using the porous medium at these regions. Keywords Porous media Metal foam Sinusoidal heat exchanger Parallel-plate Local thermal non-equilibrium List of symbols A Wave amplitude (m) Ar Area (m2) asf Fluid-to-solid specific area C Specific heat capacity (J kg-1 K-1)
& Masoud Afrand [email protected] 1
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
2
Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
3
Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran
4
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
5
Laboratory of Magnetism and Magnetic Materials, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
6
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
dp Da h hc hp hsf K k keff kef kes ker l Nu Nux PEC p Pr q
Particle diameter (m) Darcy number Heat transfer coefficient (W m-2 K-1) Channel height (m) Porous thickness (m) Fluid-to-solid heat transfer coefficient Permeability (m2) Thermal conductivity (W m-1 K-1) Effective thermal conductivity (W m-1 K-1) Effective thermal conductivity of porous region
Data Loading...
