Recent content by chetanladha

Hi All, I am wondering if there is any way to monitor internal corrosion in pipelines (without using pigs and interrupting the flow)? May be ultrasound waves could be used for this purpose, however I am not sure if it would be able to give a clear picture of extent of corrosion. Thanks...

Thanks a lot..!

Thanks for response. Yes its smaller or equal (Sorry couldn't rite it..).. Is plotting the function f(x) = [x/(1+x)] - ln (1 + x) best way 2 prove it??

Hi. I just saw on wikipedia that natural logarithm has such a property: [x/(1+x)] < ln (1 + x) < x (http://en.wikipedia.org/wiki/Natural_logarithm) Can anyone pls tell me how to prove this? Proving [x/(1+x)] and ln (1 + x) less than 'x' is easy.. But how abt [x/(1+x)] < ln (1 + x)...

Use of solar power to produce hydrogen.. The tech is already in place (in Canada), but is xpensive.. But i stroingly believe it'll take over in near future..

Sorry i forgot 2 mention THANKS FOR UR RESPONSE..

constant volume process. ratio of t3 to t2 = ratio of p3 to p2 p2 increases = t3 decreases t4 is a function of t3..

Hi, I have decided to increase inlet T and P of a typical diesel engine (operatiing on dual air standard cycle). THeoretically if all other parameters r same, I have observed that t2 (temp at the end of compression) and p2 increases, but t3 (temp at the end of constant volume heating) and...

Hey.. Sorry but 1 more small q. I calculated the heat flux from sun on my plate to be around 51kW. (assuming solar intensity 1000kW/m2). The stephen law gives me heat lost to the surroundings in order of 72kW (using constant value of emissivity). Apart of not using constant value of...

Thanks a lot. It was really helpful.

That was a good description. I am giving the value of emmissivity in Stefan's law, so i guess that shouldn't be a problem. I am calculating the radiation heat loss from a steel plate in open atmosphere clear sky. So, now what should i take the temperature of sky as?

Hi. I want to calculate the heat which will be lost from a body at temperature 't' to the atmosphere through radiation heat transfer. I can use Stephen's Boltzmann equation, but what should i take the temperature of surroundings as? Should it be the temperature of air or space? Thanks.

Hmm.. Makes real sense. Let me re-frame my question. I want to study the effects of low temperature (0-5 C) on a ship structure, which is made using low carbon steel. (Steel Grades commonly used AH36, DH36 & EH36) Can you please help? Thanks..!

Its certainly higher for low carbon steels. Liberty ships sank because of brittle fracture, and temperature was about 0-5 C.

Hi. At what temperature range can brittle fracture be expected in low carbon steels? Are there other parameters which govern its occurance? Thanks.