Conjugate Heat Transfer Analysis on a graphics card

Aim:

To perform conjugate heat transfer analysis on a graphics card.

Solution:

The analysis type Conjugate heat transfer (CHT) allows the simulation of the heat transfer between Solid and Fluid domains by exchanging thermal energy at the interfaces between them. It requires a multiregion mesh to have a clear definition of the interfaces in the computational domain. Such a mesh can be created with the Hex-dominant parametric operation in the mesh creator.

Typical applications of this analysis type is the simulation of heat exchangers, cooling of electronic equipment, and general-purpose cooling and heating systems.

Here we are performing conjugate heat transfer analysis on a graphics card.

Model Used for Simulation:

The model consists of

A) Base

B) Processor

C) Fin

Boundary conditions are

Inlet velocity - 1 m/s

Free Stream Temperature - 300K

Fin and Processor - Aluminium

Board - Silicon

Flow - Air

A)Base Mesh Analysis:

No of Nodes = 44508

No of elements = 258362

Below represents the element quality table for base mesh

Below represents the residuals for base mesh

Below represents the Temperature distributin on fin

Below represents the Temperature distributin on board and processor

From the above figure we can conclude that maximum tempearture is attained at 311.520K

Below represents the Heat transfer coefficient on board and processor

Below represents the Heat transfer coefficient on walls

B) Refined Mesh Analysis

No of Nodes: 86851

No of Elements: 493527

Below represents the element quality table for Refined mesh

Below represents the residuals for Refined mesh

Below represents the Temperature distributin on fin

Below represents the Temperature distributin on board and processor

From the above figure we can conclude that maximum tempearture is attained at 315.116K

Below represents the Heat transfer coefficient on board and processor

Below represents the Heat transfer coefficient on walls

Result:

S.NO Max. Temperature Heat transfer Coefficient

A 311.520 K 1587.730 W/m^2 K

B 315.116 K 1040.060 W/m^2 K