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Interaction Overview Diagram is one of the fourteen types of diagrams of the Unified Modeling Language (UML), which can picture a control flow with nodes that can contain interaction diagrams which show how a set of fragments might be initiated in various scenarios.
When solving complex energy interaction problems, it is often helpful to use a tool that was developed for this course, the Energy-Interaction Diagram. Energy-Interaction diagrams illustrate the types of energy transformations that occur when an open physical system is interacting with its environment, or with two or more substances which defined a closed physical system interact with each other. The diagram helps make clear the physical systems involved, the particular types of energy involved, and the changes in those energies resulting from the interaction over a given time interval. The initial and final states of the systems should be clearly indicated on the diagram. These diagrams are “before-to-after” diagrams. That is, they indicate the state of the systems before the interaction occurs and the state of the systems after the interaction has occurred, while not specifying any details of how the system got from the initial to the final state. We use Energy-Interaction diagrams because they are useful. They help us to systematically apply the energy conservation approach to a particular physical situation using the Energy-Interaction Model.
Figure 1.3.1: Illustration of the 'before' and 'after'.
Drawing Energy-Interaction Diagrams When Modeling an Interaction in a CLOSED System:
- The beginning and ending of the interaction is specified by explicitly writing down a condition of the physical system that corresponds to the beginning and end of the time interval over which the interaction occurs. These times are referred to as the initial and final times.
- The types of energy that changed during the specified time interval are indicated by circles and labeled sufficiently to identify the type of energy.
- If transfers of energy to the environment are significant, due to friction, for example, include the thermal system of the environment on the Energy-Interaction diagram. That is, enlarge the boundary of the closed system to include the environment.
- The change in each energy, whether an increase or decrease, is indicated, when known, with an “up” or “down” arrow.
- Changes in the observable parameter (indicator) associated with each type of energy that occur as a result of the interaction should be shown. If the quantitative change in the value is known, it should be given. If not, an “up” or “down” arrow can be used following the symbol of the indicator to indicate an expected increase or decrease.
- Draw a solid oval around all the 'energy circles' to indicate the system is closed.
- Below the diagram write the energy-conservation equation. You may also indicate which quantities are positive or negative for each term in the equation.
Drawing Energy-Interaction diagram Diagrams When Modeling an Interaction in an OPEN System:
The important difference between open and closed systems is that energy from outside the open physical system can be transferred into or out of the physical system as heat, Q, or work, W. (By definition, these transfers do not occur for a closed system.) The only difference, then, in the Energy-Interaction diagram for the two types, is that the diagram for an open system needs to explicitly show the transfer of Q and/or W. This is done by drawing a dashed oval around all of the energies (to indicate the open physical system boundary) and drawing arrows pointing toward or away on the boundary to show a Q or a W transfer in or our, respectively. A generic example of the Energy-Interaction Diagram for an open system is shown below.
Interaction Diagram Pdf
Figure 1.3.2: Generic Example of an Energy-Interaction Diagram in an open physical system with two substances, three types of energy, and heat leaving the system.
Interaction Diagram For Columns
Object Interaction Diagram
- What is shown in the diagram above is the minimum that must always be written down. Most of the hard thinking will have been done to get to this point. Often, many explanations of physical phenomena can be constructed using this diagram without going further and substituting in explicit expressions for the individual change in energy terms and numerical values for various parameters. Even if you are required to continue the process through to a numerical result, you must do the mental work of constructing the Energy-Interaction Diagram to this point prior to doing any numerical calculations.
- In an open-system diagram, the arrow showing energy transfer into the system is drawn in the direction of energy flow and labeled with Q or W. Do not write '-Q' or '-W' when energy is transferred out of the system. The arrow pointing away from the system is the indication that Q or W is a negative quantity. The variableitself is a quantity that could be either positive or negative. The sign is added when the variable is converted to a numerical value.