Corrosive waste-heat recovery systems suffer material degradation, performance loss and high maintenance when conventional metallic heat exchangers face chloride-, carbonate- and sulfur-bearing condensates. This study presents a multiphysics CFD-electrochemical assessment of silicon carbide (SiC) for heat exchangers, via a 3D shell-and-tube model in COMSOL Multiphysics coupling turbulent flow, conjugate heat transfer, species transport and electrochemical corrosion. The thermal model considered high-pressure ammonia (tube side) and pressurized water (shell side); the corrosion model represented a flue-gas condensate/electrolyte containing Cl\(^-\), NH\(_4^+\), HCO\(_3^-\), CO\(_3^{2-}\), HSO... More >

This paper analytically investigates unsteady, laminar, magnetohydrodynamic (MHD) mixed convective oscillatory flow of two immiscible viscous fluids through a horizontal two-phase channel. The channel consists of a porous upper region (Region~I, $0 \le y \le h$) and a non-porous lower region (Region~II, $-h \le y \le 0$), separated by a permeable interface, with a uniform transverse magnetic field $B_0$ applied normal to the flow. The governing equations incorporate thermal buoyancy ($Gr$), concentration buoyancy ($Gc$), Darcy porous resistance, thermal radiation (Rosseland approximation), volumetric heat generation/absorption, first-order destructive chemical reaction, and the Soret effect... More >

This paper presents a coupled numerical-analytical framework for investigating the influence of the oil film dynamics on the vibration characteristics of the hydraulic piston pump. A finite difference solver is developed to compute the hydrodynamic pressure distribution in the distribution plate under realistic operating conditions, from which equivalent stiffness and damping coefficients are extracted using analytical squeeze-film relations and integrated into a single-degree-of-freedom vibration model. For the baseline case (\( \mu = 7.7 \times 10^{-4} \, \text{Pa·s}, \, \omega = 4000 \, \text{rpm}, \, p_p = 21.5 \, \text{MPa}, \, \gamma = 14^\circ \)), the simulation yields a mean pressu... More >

This study investigates the heat transfer and Marangoni convection flow of a hybrid Al$_2$O$_3$-Cu/water nanofluid over a stretching/shrinking sheet. Surface tension-driven thermal Marangoni convection arises from the wall temperature gradient. The novel aspects include the combined effects of a Riga plate, thermal radiation, the Darcy--Forchheimer model, and Casson fluid characteristics. The Riga plate, comprising magnets and electrodes, generates a Lorentz force influenced by the fluid's vertical electrical conductivity. Similarity transformations convert the governing partial differential equations into ordinary differential equations, which are numerically solved using MATLAB's bvp4c sol... More >

This study investigates heat transportation in slip flow of a non-Newtonian fluid with thermal stratification over a stretched surface, a configuration that closely represents many industrial and engineering processes. The inclusion of slip effects and non-Newtonian rheology provides a more realistic description of flows encountered in polymer extrusion, coating technologies, micro- and nano-scale devices, and biomedical systems. Thermal stratification is incorporated to model non-uniform temperature environments commonly observed in heat exchangers, cooling of electronic components, and energy systems. The governing partial differential equations for momentum, energy, and nanoparticle conce... More >

This study investigates the three-dimensional magnetohydrodynamic (MHD) radiative flow and heat transfer of a kerosene-based hybrid nanofluid containing Al$_2$O$_3$ and Cu nanoparticles over a stretching sheet. The governing partial differential equations (PDEs) are formulated and transformed into a coupled system of ordinary differential equations (ODEs) via suitable similarity transformations. The resulting nonlinear ODEs are solved using the Homotopy Analysis Method (HAM), with the effects of various physical parameters on velocity and temperature profiles illustrated through graphical and numerical results. Furthermore, the influences of key parameters—including skin friction coefficie... More >

This editorial outlines the evolving role of thermo-fluid sciences in advancing sustainable energy systems amid the global energy transition. It highlights key research frontiers, including decarbonization of thermal power and propulsion, next-generation renewable thermal technologies, advanced thermal management and energy storage, innovative working fluids, and the integration of AI/ML with high-fidelity simulations. The journal calls for interdisciplinary, multi-scale studies that link fundamental thermo-fluid advances to system-level sustainability impacts, such as exergy efficiency, life-cycle emissions, and grid resilience. IJTFSSE aims to serve as a leading platform for rigorous resea... More >

This study presents an analytical mathematical model for an integrated microbial fuel cell--oxic--anoxic bioreactor (MFC--OB--ANB) system designed for simultaneous slaughterhouse wastewater treatment and energy recovery. The model incorporates bioelectrochemical oxidation, nitrification, and denitrification processes using acetate as a representative substrate. Closed-form analytical solutions are derived for substrate degradation, nitrogen transformation, current density, and system voltage. The effects of biofilm thickness, membrane conductivity, and influent substrate concentration on treatment efficiency and power generation are systematically investigated. Results reveal that enhanced b... More >