Entropy generation in conjugate mixed convection of a rough cylindrical surface confined within a square chamber under internal heat generation
Year: 2025
Type: article
Abstract: This study investigates conjugate mixed convection in a lid-driven cavity containing a rough-walled cylinder with internal heat generation. Three roughness geometries (circular, triangular, square) and different cylinder placements are considered, with the working fluid modeled as a water-ethylene glycol mixture undergoing laminar flow (10 3 ≤ Gr ≤ 10 5 , 31.62 ≤ Re ≤ 316.23, 0.1 ≤ Ri ≤ 10). The dynamics of fluid motion and thermal distribution within the solid cylinder and the cavity are dictated by two-dimensional Navier-Stokes and energy equations, which are numerically resolved through the finite element approach. The current study reveals that a circular-shaped rough cylinder positioned at the center of the cavity yields better optimization through ECOP and effectiveness when there is no internal heat generation. With the internal heat generation, thermal transport drops around 10 % at a high Re, whereas the ECOP drops around 70 % for the entire range of parameters. Hence, the other parameter should be optimized to mitigate this adverse situation when the system involves heat generation.
Source: Annals of Nuclear Energy
Authors: Mohammad Shakhawat Khan, Md. Maruf Tahmid, Saad Al Razee, Tawsif Iqbal, Sumon Saha
Institution: Bangladesh University of Engineering and Technology
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,820
OpenAlex ID: W4414435729