Week 6 - CHT Analysis on a Graphics card

THEORY:

In this project a steady state conjugate heat transfer analysis oon a graphic card has become an everyday used object and a very important part of any computer system, laptops etc. this product is mass produced daily in millions and has made computers exceptionally efficient as they consume electricity to operates and running a heavy software or graphically task on computer takes a payable use on its graphic card because of which it generates a large amount of heat.

There is a limit to any system that can hold heat to keep its part under safe operating condition.we can not go past these limits as it will damage the system cause failure of the product and system etc. but what we can do is measure to cool this sytem cool the graphic card so the system keeps running at optimum speed and condition.there are various method of cooling electrical components through fan, thermal pastes and gel, double fanning using materials that help dissipating the heat in the fans direction arrangement of components etc

in our simulation conjugate heat transfer analysis is done on graphic card model card model by appling heat on the processor of the graphic card whiule it contained in an encloser. the air is passed at a certain velocity through the encloser and we observe the heat dissipation through the fins by conduction from the procesor then observe how the flowing air cools the fins and observe the heat transfer taking place through it.

 

GEOMETRY:

3D MODEL:

 

PART DESCRIPTION:

BASE:

COMPONENT:

FINS:

PROCESSOR:

 

MESHING:

BASE LINE MESH AT DEFAULT SIZE

  

 

REFINED MESH at different location:

BASE: 3mm

PROCESSOR: 0.5mm

COMPONENTS: 0.6mm

FINS: 0.5mm

OUTER ENCLOSER: 3mm

STATISTICS:

NODES=75009

ELEMENTS=425235

 

  

 

SET UP SOLUTION

Solver type: pressure based

Steady state solver

Energy equation is on

Turbulent model : K-Omega SST Model

 

BOUNDARY CONDITIONS:

Inlet velocity=5 m/s

initial temperature= 300k

 

CELL ZONE CONDITION:

*Set processor core as source term as heat is generatedby it ingraphic card.

consider,

power supplies to core(p)= 6w

we have,

volume of processsor(v)=64 mm^3

there fore heat generated= p/v = 93750000 w/m^3

NOTE: here in this name of processor is graphic card to clear zone error:

MATERIAL ASSIGNED ARE AS FOLLOWS:

BASE: stell

COMPONENTS: titanium

FINS: aliminium

PROCESSOR: gold

encloser is filled with air.

 

RESULTS:

BASE LINE MESH 5 m/s (inlet velocity) 

RESIDUAL:

FRONT VIEW:

BACK VIEW

TEMPERATURE

HEAT TRANSFER 

STRAM LINE 

VECTOR LINE

 

 

NOW REFINED MESH  FOR 1 m/s (velocity)

RESIDUAL:

FRONT VIEW:

BACK VIEW:

TEMPERATURE:

GLOBAL HOTSPOT REGION:

LOCAL HOTSPOT REGION:

TEMPERSTURE AROUND PROCESSOR:

HEAT TRANSFER:

STREAM LINE:

VECTOR LINE:

 

 

 

NOW REFINED MESH  FOR 3m/s ( inlet velocity)

RESIDUAL:

FRONT VIEW:

BACK VIEW:

TEMPERATURE:

GLOBAL HOTSPOT REGION:

LOCAL HOTSPOT REGION:

TEMPERATURE AROUND PROCESSOR:

HEAT TRANSFER :

VECTOR LINE:

STREAM LINE:

 

 

NOW REFINED MESH  FOR 5m/s ( inlet velocity)

RESIDUAL:

FRONT VIEW:

BACK VIEW:

TEMPERATURE:

GLOBAL HOTSPOT REGION:

LOCAL HOTSPOT REGION:

TEMPERATURE AROUND PROCESSOR:

HEAT TRANSFER:

VECTOR LINE:

STREAM LINE:

 

SR NO.	Inlet velocity (m/s)	Maximum temperature attained
1	1 m/s	409.4 K
2	3 m/s	356.3 K
3	5 m/s	341.9 K

 

From this we can conclude that as inlet velocity get increased ....heat generated get decreased.