[솔루션] Heat and Mass Transfer A Practical Approach 2nd Edition Cengel[상콤하게]

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설명 : 문서명 ??? [솔루션] Heat and Mass Transfer A Practical Approach 2nd Edition Cengel 구성챕터??? 1~12챕터구성

문서일부 Chapter 1  BASICS OF HEAT TRANSFER  Thermodynamics and Heat Transfer  1-1C Thermodynamics deals with the amount of heat transfer as a system undergoes a process from one  equilibrium state to another. Heat transfer, on the other hand, deals with the rate of heat transfer as well as  the temperature distribution within the system at a specified time.  1-2C (a) The driving force for heat transfer is the temperature difference. (b) The driving force for electric  current flow is the electric potential difference (voltage). (a) The driving force for fluid flow is the pressure  difference.  1-3C The caloric theory is based on the assumption that heat is a fluid-like substance called the "caloric"  which is a massless, colorless, odorless substance. It was abandoned in the middle of the nineteenth  century after it was shown that there is no such thing as the caloric.  1-4C The rating problems deal with the determination of the heat transfer rate for an existing system at a  specified temperature difference. The sizing problems deal with the determination of the size of a system  in order to transfer heat at a specified rate for a specified temperature difference.  1-5C The experimental approach (testing and taking measurements) has the advantage of dealing with the  actual physical system, and getting a physical value within the limits of experimental error. However, this  approach is expensive, time consuming, and often impractical. The analytical approach (analysis or  calculations) has the advantage that it is fast and inexpensive, but the results obtained are subject to the  accuracy of the assumptions and idealizations made in the analysis.  1-6C Modeling makes it possible to predict the course of an event before it actually occurs, or to study  various aspects of an event mathematically without actually running expensive and time-consuming  experiments. When preparing a mathematical model, all the variables that affect the phenomena are  identified, reasonable assumptions and approximations are made, and the interdependence of these  variables are studied. The relevant physical laws and principles are invoked, and the problem is formulated  mathematically. Finally, the problem is solved using an appropriate approach, and the results are  interpreted.  1-7C The right choice between a crude and complex model is usually the simplest model which yields  adequate results. Preparing very accurate but complex models is not necessarily a better choice since such  models are not much use to an analyst if they are very difficult and time consuming to solve. At the  minimum, the model should reflect the essential features of the physical problem it represents.

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