Open system Definition and 25 Threads

In our class, we're using Wassermann's Thermal physics as textbook. I always try to solve all question which included in Text book. But sometime when I meet a problem that look like easy but actually hard, I'm so embarrassed. This problem do also. First, in the textbook grand potential for van...

Homework Statement Hot and cold streams of a fluid are mixed in a rigid mixing chamber. The hot fluid flows into the chamber at a mass flow rate of 5 kg/s with an energy in the amount of 150 kJ/kg. The cold fluid flows into the chamber with a mass flow rate of 15 kg/s and carries energy in the...

Is it possible for an open system to reach thermal equilibrium? why/why not?

Hi guys, I am currently working on my master thesis. I am supposed to make a dynamic model for a gas system and have some trouble setting up the energy balance. I am a noob when it comes to uploading pictures, so I don't have a figure for this, but let's consider a general control volume (CV)...

If you had the Casimir effect pushing two plates together, would that be an open or closed system? And why? I haven't been able to find a satisfying answer/explanation to that.

Ecosystems are open systems, they receive solar energy and other materials from outside the ecosystem and migration of animals is also witnessed. I read Physics uptil class XII and have done a bit of research on google books and have come across these three books: 1.Towards a Thermodynamic...

[Question] So I was thinking about Physics for some time and for the sake of curiosity I've came with this problem: Let's say we have a liquid flowing into a system with infinite space. The flow is constant ( F ) The liquid decays over time with a half life ( λ ) We're looking for the Total...

The question here is simple; would the existence of virtual particles make the universe an open system? And if not, why? I thank all who consider this question for their time and would love to hear an answer.

Is there anywhere in physics textbooks , or anywhere else, a section on KINETICS OF ROTATING FLEXIBLE, CONSTRAINED BODY BY GRAVITY ( TURBINE ROTOR IN BEARINGS), NON-INVARIANT (Time -translation invariance by Noether’s theorem), WITH ECCENTRIC MASSES, TORQUE DRIVEN AT NON-CENTROIDAL AXIS...

1. Homework Statement We want to heat up 200 liters of water in a bathtub from 15 ◦C to 30 ◦C. The temperature is increased by adding marble stones to the water. The initial temperature of the marble stones is 773, 15 K. Assume that the marble is rigid, with the heat capacity cm = 0.88 J ·K−1...

Hello all! I have a hard time about this one: Think of an adiabatic process (can be either reversible or irreversible - doesn't matter). dQ = 0. Assume only, mechanical work is done on/by the system. So by 1st law of thermodynamics, dU =dW. Now, everything is clear to me when I am dealing...

I learned that vapor pressure is defined in a closed system, but some questions ask me to consider vapor pressure in an open system. How is vapor pressure defined exactly? And where is this pressure acting against? Also why is it that at the boiling point, the vapor pressure and the atmospheric...

Homework Statement >A gas flows through a small orifice in a pipe as shown above. On the higher pressure side, the gas is at 1Mpa and temperature of 300K. The pressure reduces to 1kPa after it flows through the orifice. The equation of state for the gas is v=\frac{RT}{P}+10^{-6}T^2 If the...

Hello everyone, I have a physics question on pressure exerted by a fluid onto an object (see attachment). I would like to know how I can calculate the total pressure exerted on an object in a vessel by flowing fluid (water) with an open outflow. It has been too long since I took college...

Homework Statement An insulated nozzle receives are at a negligible velocity at a pressure of 150kpa and temp of 25 degrees C. if the flow passing through the nozzle expands to 100kpa in an isentropic process, calculate the temperature and velocity of the air leaving the nozzle.The Attempt at a...

HelloI have learned about maxwells relations and can derive them. I noticed that we had made an assumption of a closed system. We just learns about chemical potential and the fundamental relations for an open system. I had a thought experiment that there may exist maxwells relations for an open...

Homework Statement Is this equation correct for the 1st Law of Thermodynamics for an Open System (Control Volume): Q - W + min(h + 1/2(c^2) + gz)in - mout(h + 1/2(c^2) + gz)out = Δ(U 1/2(c^2) + gz). Homework Equations None really. The Attempt at a Solution This isn't so much an...

Hi, I have a question relating to normalizing air flow data in an open system… The system comprises of a regulator feeding 2barg line pressure to a valve (controlling the downstream flow), a variable restriction, a second valve (normally open) and a flow meter. Pressure readings are taken...

I am trying to determine how to accurately model an open system which includes: A tank: Volume = 1320 gallons An exit pipe from tank: Diameter = 3 inches The tank is compressed from atmospheric conditions to a final pressure of 100 psig. Then the tank is allowed to decompress by opening a...

Homework Statement A thermally insulated piston cylinder device initially contains 0.2m^3, 0.8kg of air at 20 degrees Celcius, and the piston is free to move. Now air at 600kPa and 80 degrees Celcius is slowly applied to the device through a supply line until the volume increases by 50...

Well, if we consider the universe as a closed, isolated system, then the law of conservation of momentum should kick in. P = MV We know that Hubble's law states that the velocity of bodies on an astronomical scale is increasing and P is a constant, so that means M must be decreasing...

Hi There I'm wokring on a miniature steam car ~0.7kg. I've decided that I would like to investigate the feasibility of propelling the car with a steam jet. So I found a couple of equations that work on the velocity of the exhaust. Equation 1) De Laval nozzel equation for the velocity of the...

Hello everyone, I am a student major in physical chemistry, but my PhD supervisor ask me to do some theoretical research in the field of quantum open system i.e. quantum transport. I feel it beyond my reach. I've learned that the this field belongs to non equilibrium quantum statistical...

Homework Statement I am confused about this solution. The question explicitly says that the systems are allowed energy exchange, so why is energy held fixed in the equation after "therefore"? Homework Equations The Attempt at a Solution

I'm curious about the open system interconnect model. I was wondering which layers of the OSI model are both hardware and software related? How does the OSI model package the data for transmission? I don't believe that the OSI model is perfect, what do you think could improve it? Do all...