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Type: Posts; User: thermal

by thermal
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2,419

2. ## Thread: MATLAB for Mechanical Engineers

by thermal
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8
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2,419

### My MathCad version went warm when I was an active...

My MathCad version went warm when I was an active engineer. Now, I am retired and it is not economically sound for me to pay a licence. But, now and then I run into problems for which MathCad would...
3. ## Thread: Calculation the temperature at certain length

by thermal
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13
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1,934

### Michael Ross, bonsoir I sort of like your...

Michael Ross, bonsoir

I sort of like your approach. Calculation conditions, testing conditions and actual conditions are not the same. In particular, the velocity profile in a channel that...
4. ## Thread: Calculation the temperature at certain length

by thermal
Replies
13
Views
1,934

### Wmech, bonsoir It pleases me that you guys...

Wmech, bonsoir

It pleases me that you guys are using Q_dot and m_dot as variables. The “dot” is a time derivation so Q_dot=[Joules/s] =[Watt] and the m_dot=[kg/s]. During my studies, and this is...
5. ## Thread: Calculation the temperature at certain length

by thermal
Replies
13
Views
1,934

### Wmech, bonsoir Watch out here, there are...

Wmech, bonsoir

Watch out here, there are numerous definitions of dT. One is the difference between air_out and air_in which should be used in the energy equation Q_dot = m_dot * cp * dT.
...
6. ## Thread: Calculation the temperature at certain length

by thermal
Replies
13
Views
1,934

### Wmech, bonsoir I sort of believe that you are...

Wmech, bonsoir

I sort of believe that you are on the right trace but lets get more profound.

The 60 000 BTU/h is a power. Is it generated by some kind of electrical coil or by a heat...
7. ## Thread: Material of Heat Sink

by thermal
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8
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2,759

### The material issue is just one of many that...

The material issue is just one of many that determine the qualities of a good a heat sink. There are lots of compromises to be made. Not at least the ability to form optimum fins at a convenient...
8. ## Thread: Heat Transfer Estimation

by thermal
Replies
1
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1,154

### Re: Heat Transfer Estimation

This is what I would do. It is a little bit swingy but after all you are asking for an estimate.

The only air property that has an impact on convection at high pressures is the density. The...
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