ES 202 Fluid and Thermal Systems Lecture 6 ES 201 Review Steady State Devices 12 12 2002 Assignments Reading Cengel Turner Section 11 2 11 3 ES 201 notes Homework 5 62E 5 75 in Cengel Turner 7 problems altogether due on Monday Road Map of Lecture 6 Announcements Revisit problems on hydrostatics qualitative comparison of hydrostatic force hanging weight problem Review of ES 201 concepts Fundamentals of control volume analysis common structure of accounting equation steady state device nozzle diffuser turbine compressor heat exchanger function design assumption modeling assumption Announcements Announcement on problem session Thursday from 7 pm to 8 30 pm For Section 6 only Lab write up due tomorrow by 5 pm at my office Revisit Hydrostatics Compare the hydrostatic forces acted on Surface AB not the bottom of the tank in the following configurations A A B A B B Revisit Hydrostatics cont d Consider the following set up Describe the reading on the balance as the weight is gradually lowered into the water tank Assume the tank is large enough that no over flowing occurs Hint It may be helpful to consider the following possibilities separately partially submerged condition rope completely submerged conditions but does not reach the bottom of tank resting at the bottom of tank Will your conclusion be different if the water is filled up to the brim before the weight is lowered Explain your answer balance ES 201 Review Conservation and Accounting Principles Common structure of accounting equation for an open system storage in out production The above equation can be expressed in rate form finite time form Major difference between the accounting of various extensive properties means of transport can be classified as in term production Production Physics The simple book keeping form does not contain any physics It is true in general even in balancing your check book The physics part comes in through the prescription of the production and in terms What is the production and in for the followings mass energy momentum entropy In Class Exercise Write down the accounting equation for energy in rate form for an open system Steady State Devices List the purpose design assumption and modeling assumption for the following devices nozzle diffuser turbine compressor fan blower pump heat exchanger Turbine Steam turbine Water turbine hydro electricity Wind turbine hill slopes Gas turbine engine compressor combustor turbine multiple rotor stator stage
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