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Optimization of Wave Inclination Angle in Parallel Wavy-Channel Heat Exchangers

  • Rahim HassanzadehEmail author
  • Mehran Abadtalab
  • Ali Bayat
Research Article - Mechanical Engineering
  • 33 Downloads

Abstract

Effects of the wave inclination angle on the performance of a parallel wavy-channel heat exchanger are investigated three-dimensionally. Computations have been carried out in various Reynolds numbers in the laminar range from 100 to 600 by means of the finite volume approach. On the other hand, several wave inclination angles such as α = 0°, 20°, 40°, 60°, and 80° with respect to the spanwise direction have been examined to find the optimum value. The applied numerical method has been validated against the available data of the conventional parallel flat-channel heat exchanger. Several quantitative and qualitative results are presented in this investigation. It is demonstrated that deflection of waves of plates from zero to nonzero values onsets the three-dimensional flow in the heat exchanger. In addition, maximum heat transfer enhancement of 108% is achieved for Re = 600 at the wave inclination angle of 20°. Moreover, except at Re = 100, the wave inclination angle of 40° can be introduced as an optimum inclination angle for a wavy-channel heat exchanger from the perspective of thermal–hydraulic performance. At the end of this study, values of pressure drop penalty and thermal–hydraulic performance of all cases under consideration have been determined accordingly.

Keywords

Heat transfer enhancement Wave inclination angle Heat exchanger Wavy channel 

List of Symbols

\(a\)

Wave amplitude (m)

\(c_{\text{p}}\)

Specific heat (J/kg °C)

\(D_{\text{h}}\)

Hydraulic diameter (m)

\(H\)

Channel height (m)

\(k\)

Thermal conductivity (W/m °C)

\(L\)

Channel length (m)

\(Nu\)

Mean Nusselt number

\(Nu_{x}\)

Local Nusselt number

\(p\)

Pressure (Pa)

\({\text{PI}}\)

Thermal–hydraulic performance index

\(Pr\)

Prandtl Number

\(\Delta p\)

Pressure drop (Pa)

\(\Delta p^{*}\)

Non-dimensional pressure drop

\(Re\)

Reynolds number

\(t\)

Time (s)

\(\Delta t\)

Time interval (s)

\(T\)

Temperature (°C)

\(T_{\text{in}}\)

Inlet temperature (°C)

\(T_{\text{m}}\)

Bulk temperature (°C)

\(T_{\text{s}}\)

Surface temperature (°C)

\(T_{\text{out}}\)

Outlet temperature (°C)

\(u\)

Streamwise velocity (m/s)

\(u_{\text{m}}\)

Mean streamwise velocity (m/s)

\(\nu\)

Vertical velocity (m/s)

\(V\)

Velocity magnitude (m/s)

\(w_{\text{RMS}}\)

Root mean square of spanwise velocity (m/s)

\(w\)

Spanwise velocity (m/s)

\(W\)

Channel width (m)

\(x\)

Streamwise coordinate

\(x^{ + }\)

Dimensionless axial distance of hydrodynamic entrance region

\(x^{*}\)

Dimensionless axial distance of thermal entrance region

\(y\)

Vertical coordinate

\(z\)

Spanwise coordinate

Greek Symbols

\(\rho\)

Density (kg/m3)

\(\upsilon\)

Kinematic velocity (m2/s)

\(\alpha\)

Wave inclination angle (°)

\(\theta\)

Non-dimensional temperature

\(\lambda\)

Wave period (m)

Abbreviations

\(Re\)

Reynolds number

\({\text{RMS}}\)

Root mean square

\({\text{PI}}\)

Thermal–hydraulic performance index

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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Faculty of Mechanical EngineeringUrmia University of TechnologyUrmiaIran

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