Recent content by hybro

So that means we will always have liquid and vapor in the tank ? impossible to have only vapor if the temperature rise ?

Hi all, I have some troubles with some basics thermodynamic rules. I have a sealed tank filled with fuel at Patm and at a temperature T. In this tank after filling, is composed of 3/4 liquid and 1/4 gas. I was wondering how the pressure inside the tank will change if we change the boundaries...

Hello guys, I have some troubles to understand a reversible adiabatic expansion. we have dq=0 and dw=-pdV and for a perfect gas dU= Cv*dT. I don't really understand why dU= Cv*dT since we have a variation of volume and it is established that dU= Cv*dT when we haven't any modification of the...

Sorry I didn't have internet this last few days. Thank you for your explanations I understand cleary how that works now. However u have 2 last questions.Is The gas pressure value always equal to the pressure of the fluid ? When the nitrogen gas is compressed, some fluid flows in the...

Thank you for the answer. I had a look and indeed there is an enthalpy transfer to the fluid. I have checked some documents about accumulators. What i understand is (please correct me if I'm wrong): The accumulator follows the Boyle Mariotte law and is composed of a fluid and gas separated by a...

Thank you for the answer. The pump inlet is a fixed volume of fluid with an initial state variable at 1 atm. I have a centrifugal pump in the circuit. As 256bits mentionned the energy added by the pump has rised the temperature of the fluide and the pressure. I have confused a 100% efficiency...

Hello, I'm performing some simulations of apump with a hydraulic accumulator. I don't understand clearly the results. In a closed loop, i connected a pump with a Valve in order to create a pressure drop. The results are a linear increase of the pressure in the circuit and the pressure drop is...

Thanks for your post. Yes exactly I am talking about a real gas. I have a valve between a pipe and the vessel. The gas flows from the vessel to the pipe from an initial pressure of 200 bar. The pipe is at atmospheric pressure and ambiant temperature with air composition. I want to know if...

Hello guys, I want to study the temperature evolution of a gas in a vessel from 200 bar to 20 bar. I made the assumption the expansion is isentropic. However I have some trouble to represent the heat exchange between the wall and the gas. I used the energy conservation (transfer from a...