Unsteady-State Heat Conduction in a Cylinder

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

This Demonstration simulates the transient cooling of a cylinder that is suddenly immersed in a cooling bath.

[more]

Consider a homogeneous solid cylinder of radius and length initially at uniform temperature . The cylinder is immersed at time into a fluid in a well-stirred, insulated tank at constant temperature .

The equation describing the temperature of the cylinder is:

,

subject to the following initial and boundary conditions:

,

,

,

,

,

where is the radial coordinate, is the axial coordinate, is the thermal diffusivity, and is the heat transfer coefficient between the fluid and the cylinder.

This problem is more conveniently solved with the following dimensionless variables:

: dimensionless temperature,

: dimensionless radial coordinate,

: dimensionless axial coordinate,

: dimensionless time.

The heat equation in terms of these dimensionless variables is:

,

with

,

,

,

,

,

where is the Biot number, the ratio of internal resistance to conductive heat transfer in the cylinder to the external resistance of convective heat transfer of the cylinder to the surrounding fluid. The dimensionless partial differential equation is solved using the built-in Mathematica function NDSolveValue with Neumann boundary conditions for several values of dimensionless time, radius and Biot number.

[less]

Contributed by: Clay Gruesbeck (December 2016)
Open content licensed under CC BY-NC-SA


Snapshots


Details



Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.
Send