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Wall temperature of an internally finned tube has been computed numerically for different fin number, height, and shape by solving conservation equations of mass, momentum, and energy using Fluent 12.1 for a steady and laminar flow of fluid inside a tube under mixed flow condition. It has been found that there exists an optimum number for fins to keep the pipe wall temperature at a minimum. The fin height has an optimum value beyond which the wall temperature becomes insensitive to fin height. For a horizontal tube, under mixed flow condition, it is seen that the upper surface has higher average temperature than the lower surface. The impact of fin shape on the heat transfer rate shows that wall temperature is least for triangular-shaped fins, compared to rectangular- and T-shaped fins. In addition to the thermal characteristics, the pressure drop caused due to the presence of fins has also been studied.

In this study, an upright hollow cylinder made of aluminum with varying thicknesses is analyzed through computational methods to explore the impact of cylinder wall thickness and aspect ratio on formation of entropy and natural convection. The outer wall of the cylinder is open to ambient air at 300 K, while the inner cylinder wall has a stable temperature of 450 K. The Navier–Stokes equations, continuity equation, and energy equations are solved using the finite volume method in the computational domain, which includes the vertical cylindrical open cavity. Ansys-Fluent software (2018 commercial edition) is utilized to specify flow properties and thermal energy exchange. The study considers relevant parameters such as the Rayleigh number (whose range is set to be 10 +4 to 10 +8 ), aspect ratio ( L/D ) of the vertical cylindrical open cavity (2, 4, 6, 8, 10), and cylinder wall thickness (0, 1, 2, 3, 4 mm). Static temperature and formation of entropy schemes are used to demonstrate the thermodynamic pattern, while the thermal performance is evaluated using the merit function ( I/Q ) with regards to the first and second laws of thermodynamics.

Roadside data collecting and communication applications might all benefit from power produced by energy harvesting from highways. According to the energy source they tap, roadside energy harvesters may be roughly divided into three categories: solar radiation, pavement heat, and mechanical energy from moving automobiles. In addition to environmental issues like the heat island impact on cities, asphalt pavements exposed to sun radiation may reach high temperatures that result in structural damage from hardening or rutting resulting from heat cycles. Asphalt solar collectors (ASCs) are one of the types of active systems that are doubly effective since they alleviate the difficulties that were described before and. Furthermore, ASCs can capture energy that can be utilized in a variety of different applications. To provide a complete picture of recent scientific developments, this review covers numerical, experimental, and numerical and experimental research on ASCs. Specifically, the setup, design parameters, advancement, challenges, and mathematical modeling of ASCs are systematically discussed. Accordingly, a number of suggestions for further research projects have been made in light of the associated results.

This study is an in-depth look at previous investigations on heat transfer analysis in trapezoidal enclosures. It intends to give a full picture of flow and heat transfer performance in these types of cavities in two different configurations: one filled with nanofluids and the other with a mix of nanofluids. Thermophoresis, magnetic forces, and the buoyancy effect are examples of the factors that are considered in this investigation of heat transport in cavities. In addition, only single-phase flows are included in this study, which emphasizes on flow and heat transfer processes. The review has covered 35 published research between 2011 and 2024, with detailed discussion of heat transfer analysis in lid-driven trapezoidal enclosures. The most significant conclusions of this research are that, for each type of fluid, an inclination of the magnetic field considering the horizontal axis results in the maximum heat and mass transfer in addition to the highest average total entropy production. It is also ascertained that the efficiency of the magnetic field application can be improved when the coefficients for heat absorption and heat production are higher. Finally, larger nanoparticle sizes and a larger radius for the revolving cylinder would improve flow circulation in the area immediately around the cylinder. The results of this research have wide-ranging implications, for example solar thermal technology, electronic cooling and energy storage and nuclear reactors.

In this study, a diesel engine was used to operate with blends of light fraction waste cooking oil (LFWCO) with diethyl ether (DEE). DEE was blended as an additive in the 5% to 20% ratio in steps of 5% each. The test indicates that LFWCO+15-DEE produced optimum results regarding performance and emission. The BSFC for LFWCO+15-DEE was found to be higher by about 28.9%, and the BTE was lower by about 7.6%, in contrast to diesel, at 100% operating load, respectively. For LFWCO+15-DEE the EGT was lower by about 11.9%, in contrast to neat diesel, at 100% operating load. The various emissions such as carbon monoxide (CO), nitrous oxide (NO), and smoke opacity for LFWCO+15-DEE were found to be lower by about 32.9%, 25%, and 29.4%, but the NO release was more than other blends and it was about 36%, in contrast to diesel at 100% operating load, respectively.