Recent content by Chestermiller

  1. Chestermiller

    Construction of a model of a hydraulic damper

    Is this an existing physical piece of equipment that you can perform experiments on, or is it a schematic of a damping concept that you are analyzing and proposing to fabricate?
  2. Chestermiller

    Construction of a model of a hydraulic damper

    Are you familiar with lubrication flow analysis? Do you know how to solve the problem of laminar flow between two infinite parallel plates?
  3. Chestermiller

    Construction of a model of a hydraulic damper

    I would first derive and solve the equations for the fluid dynamics of the system. Do you know how to solve axial annular laminar flow of a viscous fluid?
  4. Chestermiller

    Construction of a model of a hydraulic damper

    The viscous damper I described in post #2 does not require CFD analysis to quantify its behavior. It can solved analytically for the damping force as a function of the piston velocity. Are you willing to accepts this kind of device as a model for what your are trying to describe. What are...
  5. Chestermiller

    Construction of a model of a hydraulic damper

    I'm thinking of a cylinder with a piston in which the clearance between the piston and the cylinder wall is finite. The piston is long, and the cylinder is oriented vertically, with a viscous liquid between the base of the piston and the cylinder. The length of the clearance between the piston...
  6. Chestermiller

    Construction of a model of a hydraulic damper

    Damping is often approximated using an ideal dashpot. Is that what you are searching for: an approximate equation for the dashpot coefficient as a function of the damping fluid and hydraulic damper design? Are you considering doing experiments to measure the damping coefficient in independent...
  7. Chestermiller

    Need help with pressurized air

    100% RH means that the partial pressure of the water in the tire is equal to the equilibrium vapor pressure of water at the air temperature in the tire. This can be considered the dew point of the air. Any drop in the temperature of the air will cause water to condense out (at 100% humidity)...
  8. Chestermiller

    Undergrad Difference calculating enthalpy change by using thermodynamic table A-17 vs. A-2 with integration

    The table in the first method used integration with respect to temperature also. It would seem to be a matter of the difference in the accuracy of the two fits of Cp. vs T.
  9. Chestermiller

    Spring aproximation

    Yes, neglecting dissipation factors such as air drag.
  10. Chestermiller

    Undergrad Is Callen right in claiming dQ=TdS for all quasi-static processes?

    A quasi-static path is considered to represent a continuous sequence of thermodynamic equilibrium states.
  11. Chestermiller

    Undergrad Joule-Thomson Expansion

    Who says that in thermodynamics, we study gases that are in thermodynamics equilibrium? The states of the gas in irreversible processes do not have to be equilibrium states; only the initial and final status have to the thermodynamic equilibrium states. There are 2 thermodynamic equilibrium...
  12. Chestermiller

    Old man, new member

    Was it also called the Missouri School of Mines, or is that something different?
  13. Chestermiller

    Graduate Strain Tensor Based on Clifford Algebra

    For large deformations, the definition of the strain tensor is not unique. There are many tensorial forms at large deformation that reduce to the same infinitesimal strain tensor in the limit of small deformations. For example $$\boldsymbol \epsilon=\frac{1}{2}(\bf G-\bf I)$$where G is the...
  14. Chestermiller

    Rubber tyre “melting” inside, turned to deadly goo. Why?

    Thermal chemical decomposition of the rubber.
  15. Chestermiller

    High School Internal energy and gravitation

    The more general form of the 1st law of thermodynamics is $$\Delta U+\Delta (PE)+\Delta (KE)=Q-W$$where PE is the gravitational potential energy and KE is the non-random kinetic energy.