Introduction to Computation and Modeling for Differential Equations

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Differential Equations, Mechanics, and Computation

Times the mass. OK and the mass we-- although we don't know exactly what it is, we can look up for the density of the aluminum and the size of the cube. So this is going to give us the changing energy. And what is the-- what determines how much heat has convected it into the cube? So I think I should write it like this.

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What determines Q? What determines the heat that goes through the surface of the cube into the cube? So that is Q from the gun minus Q-- so this is gun to cube right? So this is cube to air. So this is gun to cube minus cube to air. Now how do you model-- how does the rate of heat transfer from the gun to the cube depends on the temperature. And how does the rate of-- how does the heat convect from the cube to the air? Yeah, they linearly depend on the difference in the temperature. So if you look back on unit five notes-- OK.

So this is-- these are heat convection right? And the way you blow air from the gun to the cube is forced convection. So this is C-- the rate of the forced convection, it is proportional to the temperature of the hot air minus the temperature of the cube times the coefficient. And the coefficient is the forced convection coefficient in the air times the area of the convection.

So maybe we can just say 2 times the square is the temperature of the heat. And this is the rate of heat conversion. Now we time the delta of time. We are going to get the amount of heat that went into the cube during a small time unit. Now this is going to give us a differential equation. So this is the rate of change in the temperature equal to C force times 2 d squared T H minus T minus C free, 4 d squared T minus T air. So this is the differential equation we get. Now what changes when we turn off the heat gun? So that's the difference. And let's go to Matlab, and I wrote a code for simulating this.

So here is the parameters. Ambient temperature we said today is a little bit colder than I thought. And the hot air temperature, if we look at this, I think is like or something. Let's put And the start time in seconds I actually don't know, so let's just put 0 here. And the T stopped in seconds. What time is it like 11 minutes?

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What is 11 minutes in-- so this is 11 minutes right? So these are what I looked up online.

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Some of the values for the free air convection and the forced air convection. And these you don't need to look at them because they are never used in the code because radiation exactly is not important. I'm basically saying that the heating rate is proportional to two sides, and the cooling rate et. So let's do the simulation. We are getting a plot like this. And let's compare our temperatur. Oh, OK. I need to get rid of this. Let me push the stop.

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Now we are plotting. So look at the difference between the simulation and the experiment. It's huge. So what is causing this Difference It is because now here what I said is the force convection coefficient is 10 watt per meter square plus K. Now let's go to the internet and search for force convection coefficient of air. Engineering toolbox. Is it this one? Forced convection of air goes all the way from 10 to And here I am actually putting the lower bound.

If I put something like and do the simulation again, and do the experiment again, this is what I got. I've got a much better match and I also have my free convection to be 5. If you look over the internet free convection goes from 5 to And also if I go to 25 I think I am also going to be getting a much better match.

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Edsberg has over thirty years of academic experience and is the author of over twenty journal articles in the areas of numerical methods and differential equations. Preface xi 1 Introduction 1 1. Du kanske gillar. Lifespan David Sinclair Inbunden. Growth Vaclav Smil Inbunden.

Introduction to Computation and Modeling for Differential Equations Introduction to Computation and Modeling for Differential Equations
Introduction to Computation and Modeling for Differential Equations Introduction to Computation and Modeling for Differential Equations
Introduction to Computation and Modeling for Differential Equations Introduction to Computation and Modeling for Differential Equations
Introduction to Computation and Modeling for Differential Equations Introduction to Computation and Modeling for Differential Equations
Introduction to Computation and Modeling for Differential Equations Introduction to Computation and Modeling for Differential Equations

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