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Introduction
Published in Je-Chin Han, Lesley M. Wright, Experimental Methods in Heat Transfer and Fluid Mechanics, 2020
The transfer of energy, in the form of heat, can be seen in countless applications while affecting the lives of people around the world. From heat engines used for transportation and power generation, to photovoltaic solar cells; from heating and air conditioning systems, to radiative space heaters; from thermal management of the avionics in an airplane cockpit to cooking on an open fire, heat is being transferred all around us. Therefore, it is necessary to understand the physical phenomena causing energy to be transported from one entity to another. By measuring the amount of heat transfer in various systems, engineers and researchers can optimize these processes, leading to a more efficient transfer of thermal energy. Heat transfer is classified into three basic modes: conduction, convection, and radiation. Depending on the system, these modes may be isolated from one another or occur simultaneously. In the following sections, each mode is briefly discussed, so the foundation is laid to discuss the design and execution of heat transfer experiments in later chapters.
Thermal Analysis
Published in Xiaolin Chen, Yijun Liu, Finite Element Modeling and Simulation with ANSYS Workbench, 2018
Many engineering problems are thermal problems in nature. Devices such as appliances, advanced electronics, engines, and heating, ventilation, and air conditioning systems need to be evaluated for their thermal performance during the design process. In this chapter, we will discuss thermal analysis using the FEA. The objective of thermal analysis is to understand response and behavior of a structure with thermal loading. The resulting temperature distribution, heat flux distribution, and structural response under different thermal loading conditions constitute important knowledge in assuring design success of thermal engineering products. Both steady-state and transient thermal problems are introduced and a heat sink model is analyzed using ANSYS® Workbench. Thermal stress analysis, which is to find the structural response due to change of temperatures, is also included and discussed.
Thermal Stresses
Published in Mumtaz Kassir, Applied Elasticity and Plasticity, 2017
This chapter deals with determining thermal stresses induced in structural components due to nonuniform change in temperature. A uniform change in temperature causes a component to expand or contract, the shape of each element in the component is preserved, normal strains are developed without shearing strains, and if the component is free to expand and contract, no stress is developed. However, thermal stresses will develop if the component is constrained when subjected to uniform heating or if there is a nonuniform change in temperature. Also, thermal stresses are developed in materials that exhibit anisotropy in uniform heating environment. In many cases, the effect of such stresses is severe. It is essential to consider thermal stresses in the design process of components subject to adverse thermal environment like those encountered in the aerospace and chemical industries.
Particle shape effect on MHD steady flow of water functionalized Al2O3 nanoparticles over wedge
Published in Waves in Random and Complex Media, 2022
K. Thanesh Kumar, Pudhari Srilatha, Talib K. Ibrahim, B. M. Shankaralingappa, B. J. Gireesha, M. Archana
The study of mass and heat transfer in the presence of radiation has aroused the interest of a large number of researchers owing to its numerous applications. Heat transfer analysis is utilized in many technical processes, including gas turbines and other propulsion systems for missiles, aeroplanes, spacecraft, and satellites, and is impacted by thermal radiation. Electromagnetic waves are in charge of the vitality interchange in radiation control, directing vitality away from the discharging item. Smith initially noticed the thermal radiation effects when examining boundary layer fluxes. Several studies have been undertaken throughout the years to determine the radiation influence in boundary layer flows, while accounting for a range of influencing variables. Zhao et al. [41] quizzed the radiation and velocity slip impacts on the flow of a hybrid nanofluid. Kumar et al. [42] investigated the heat production impact on the nanoliquid flow with radiation impact. Gowda et al. [43] quizzed the heat generation and radiation impacts on a second grade nanofluid flow on a plate. Xiong et al. [44] discussed the impact of radiation on hybrid nanofluid flow. The radiation upshot on a dusty liquid flow on a disk was studied by Jayaprakash et al. [45].