Abstract
In the present paper, we report a numerical study of dynamic and thermal behavior of the incompressible turbulent air flow by forced convection in a two-dimensional horizontal channel. This one contains the complicated form of the deflector which has been studied by varying the inclination angle from φ = 40°, φ = 55° to φ = 65°. The baffles are mounted on lower and upper walls of the channel. The walls are maintained at a constant temperature (375 K), the inlet velocity of air is Uint = 7.8 m/s, and the Reynolds number Re = 8.73 × 104. A specifically developed numerical model was based on the finite-volume method to solve the coupled governing equations and the SIMPLE (Semi Implicit Method for Pressure Linked Equation) algorithm for the treatment of velocity-pressure coupling. For Pr = 0.71, the results obtained show that (i) the streamlines and isotherms are strongly affected by the inclinations angles at Re = 8.73 × 104, (ii) the friction coefficient near the baffles increases under the angle exchange effect, and (iii) for a constant Re, the local Nusselt number at the walls of the channel varies with increasing the inclination angle of the deflector. Furthermore, the deflectors are generally used to change the direction of the structure of flow and also to increase the turbulence levels. We can conclude that the contribution of inclined baffles improves the increase of heat and mass transfer in which the Nusselt number at a certain angle increases noticeably.
Highlights
In recent decades, heat transfer by turbulent forced convection attracted considerable attention of several researchers. is apply us in industrial domain including cooling of electronic circuit [1], thermal performance of energy efficiency [2], flow and heat transfer in solar collectors [3], lubrication technologies [4], geothermal heat exchangers [5,6,7,8] and many others
All numerical results are calculated on a computer with the Core 5 Duo processor of 4 GHz CPU. e content of the paper is structured as follows: In Section 2, we present the mathematical formulation of the physical problem while describing the turbulent forced convection and boundary conditions of the heat exchanger. e numerical analysis is presented in Section 3 with the enrichment functions used in the finite volume method
Our simulation results Numerical results of Demartini et al [25] at x = 0.525m Expérimental results of Demartini et al [25] at x = 0.525 m flow, it is observed that high fluid flow disturbance is obtained upstream of the second baffle which induces a rapid change in the direction of flow
Summary
Heat transfer by turbulent forced convection attracted considerable attention of several researchers. is apply us in industrial domain including cooling of electronic circuit [1], thermal performance of energy efficiency [2], flow and heat transfer in solar collectors [3], lubrication technologies [4], geothermal heat exchangers [5,6,7,8] and many others. According to this literature review, we note that little works have been devoted to study the heat transfer and structure fluid by turbulent forced convection. Amghar et al [11] used a finite volume method and developed analytical expression on the scale analysis to evaluate the heat performance in a horizontal channel. E channel was obstructed by two transversal baffles to study the effect of spacing between the baffles on the heat transfer and flow structure in the case of turbulent forced convection. E main objective of this work is to study a new design along the horizontal channel with complicated form baffles and to investigate numerically thermal and hydrodynamic comportment. E content of the paper is structured as follows: In Section 2, we present the mathematical formulation of the physical problem while describing the turbulent forced convection and boundary conditions of the heat exchanger.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
