The constitutive equations describe how the quantity in question responds to various stimuli via transport. The conservation laws, which in the context of transport phenomena are formulated as continuity equations, describe how the quantity being studied must be conserved. Every aspect of transport phenomena is grounded in two primary concepts : the conservation laws, and the constitutive equations. In physics, transport phenomena are all irreversible processes of statistical nature stemming from the random continuous motion of molecules, mostly observed in fluids. However, the scope here is limited to the relationship of transport phenomena to artificial engineered systems. Moreover, they are considered to be fundamental building blocks which developed the universe, and which is responsible for the success of all life on earth. Transport phenomena encompass all agents of physical change in the universe. It is now considered to be a part of the engineering discipline as much as thermodynamics, mechanics, and electromagnetism. Some of the most common examples of transport analysis in engineering are seen in the fields of process, chemical, biological, and mechanical engineering, but the subject is a fundamental component of the curriculum in all disciplines involved in any way with fluid mechanics, heat transfer, and mass transfer. Transport phenomena are ubiquitous throughout the engineering disciplines. For example, in fluid mechanics, a common use of transport analysis is to determine the velocity profile of a fluid flowing through a rigid volume. This principle is useful for calculating many relevant quantities. Thus, the different phenomena that lead to transport are each considered individually with the knowledge that the sum of their contributions must equal zero. The fundamental analysis in all three subfields of mass, heat, and momentum transfer are often grounded in the simple principle that the total sum of the quantities being studied must be conserved by the system and its environment. Mass, momentum, and heat transport all share a very similar mathematical framework, and the parallels between them are exploited in the study of transport phenomena to draw deep mathematical connections that often provide very useful tools in the analysis of one field that are directly derived from the others. While it draws from fields as diverse as continuum mechanics and thermodynamics, it places a heavy emphasis on the commonalities between the topics covered. In engineering, physics, and chemistry, the study of transport phenomena concerns the exchange of mass, energy, charge, momentum and angular momentum between observed and studied systems.
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