Determine the entropy change, Physics

In this problem we will consider a vapor fluid interface on top of a solid surface.  A schematic is shown below:

2273_Determine the entropy change.png

This is a zoomed-in picture of the edge of a liquid droplet sitting on a surface.  The change in the Helmholtz energy due to a change in the position of the vapor-liquid interface along the surface is:

916_Determine the entropy change1.png

Where  are the interaction energies (in N/m, analogous to the intermolecular potential but for macroscopic substances) between the three phases and are material-dependant constants.  L is the length of the interface in-and-out of the figure (in-and-out of the page) and θ is the contact angle

(a) Compute the work (W) required to move the liquid-vapor interface from x0 to a distance x at constant T, L and θ

(b) Find dU for this system for a given T (for constant T).

(c) You perform an experiment and find that the change in temperature as a function of distance (x) under adiabatic conditions is 10 Kelvin/mm.  Find how the contact angle would change as a function of applied heat under isothermal conditions at constant x (and constant L).


Posted Date: 3/11/2013 1:30:10 AM | Location : United States

Related Discussions:- Determine the entropy change, Assignment Help, Ask Question on Determine the entropy change, Get Answer, Expert's Help, Determine the entropy change Discussions

Write discussion on Determine the entropy change
Your posts are moderated
Related Questions
The shear force of a cantilever beam of length L carrying a uniformaly distributed load W Per unit length is how much at fixed end

Define isothermal process For isothermal process temperature remains constant i.e.  Δu = 0.  Thus according to first law of thermodynamics ΔQ =Δw Heat supplied to the syste

Q. A light of wavelength 58900A falls normally on a thin air film, 6 dark fringes are seen between two points. Calculate the thickness of the film. 2μt = nλ Thickness of th

When is a system said to have attained equilibrium. Illustrate. The change in entropy of a system, in a procedure is positive. Would the process be a spontaneous one? Describe.

Power is to be supplied from a source whose resistance is 20 K ? to a load of 100 ?. Would you consider it as a constant voltage source or current source? Explain. Ans. G

A 77.0-kg woman is walking 0.10 m/s east in the gym. A man throws a 15.0-kg ball south and accidentally hits the woman. The woman and the ball move together with a velocity

Q. Three capacitors every of capacitance 3 pF are connected in parallel. Find effectual capacitance. The effectual capacitance Cp = C1 + C2 + C3 = 9 + 9 + 9 = 27 pF

Explain the Thermodynamics - Heat and Work Thermodynamics is an area of science which looks at how changes in energy, work and the flow of heat influence each other. It can exp

The Coriolis effect is a deflection of moving objects when they are reflects in a rotating reference frame. In a reference frame with clockwise rotation, the deflection is to the l