Recent content by granzer

I am studying the rotary compressor and I have understood that the stagnation pressure and stagnation temperature both increase in the rotor stage (as energy is being added). I also read that in the stator stage the stagnation temperature remains a constant but there is loss of stagnation...

Thank you all!. All the material and explanations provided have been really helpful to get the right perspective to understanding the notion of tensors as an abstract object. What is the difference between 2 vector spaces, V and W, when a transformation(linear map) is given as T: V->W is it...

How is stress tensor written as a tensor product of 3 vectors? Which are the 2 vectors?

I know that a vector is a tool to help with quantities that have both a magnitude a direction. At a given point in space, a vector has a particular magnitude and direction and if we take any other direction at the same point we can get a projection of this vector in that direction. Tensor is a...

Thank you. Yup that makes sense. If the cost saved by the increase in efficiency does not enough justify the cost of implementation of such a nozzle.

Haha! A couple of years back I had given a talk on aerospike engine! Recently came across this video and it sparked my interest again it. Lol. I think Saber engine from UK is going to have a variable geometry nozzle.

Why is it that variable geometry nozzles, like those found on jet engine(iris nozzles), are not used as rocket nozzle to provide better altitude compensation?

@Mark44 Hello Sir, Thank you so much. The answers u gave have cleared my doubt about equation 147 and I completely agree with you. I was wondering if it should be given as a slope. And yes going right 1 step and going up 3 step gives a direction from the point. But it is also true going 3 step...

@Chestermiller Yes sir, that's what I have been doing. Heat and work are easy to be understood as inexact. But this particular example is difficult to grasp.

Can someone please explain this to me. Haven't been able to find an answer .

In How is equation 145 giving a direction(ie gradient) and not a slope?. Also here how is equation 147 arrived at? Any help would be much appreciated.

How is mass flow rate within an annular region of a pipe taken to be an inexact differential? I read it in Fluid Mechanics textbook by Yunus A. Cengel and John M. Cimbala. The mass flow rate through the annulus is given to be inexact differential. Why is mass flow through the annulus not equal...

@A.T. Thank you for your reply .. Yes, I have understood that when both bodies collide, they both have same force applied to each other in form of action and reaction. But is the body with higher velocity always reduce its velocity or rebound and have its velocity reversed(again in a way...

@sophiecentaur Thank you for your reply. Let's consider an inelastic collision. I do realize the loss of kinetic energy will be in such a way so as to respect the momentum conservation. I am interested in the direction of the momentum transfer. Is there a gradient along which the momentum gets...

Does the momentum always get transferred from lower velocity to higher velocity(may be along a negative velocity gradient.) Consider the collision between 2 bodies M1 and M2,(M1<M2) but both having the same momentum.So M1 will have a higher velocity than M2(V1>V2). Now if the velocities V1 and...