Question
• (University of Anbar - Iraq)

# What is the mass flow or inlet air velocity required to cool a CPU heatsink using jet impingement flow?

I'm just asking about how much the inlet air mass flow rate OR inlet air velocity to cool heat sinks of CPU of a desktop PC as a jet impingement flow?

Rajiv Gandhi Institute of Petroleum Technology
Actually the jet impinging on a heat transfer surface creates a thin boundary layer, and thus a high heat transfer rate is possible. Roughly speaking, the heat transfer coefficient can range 1000-3000 W/sq. m-K and this cooling method can handle heat flux as high as 1 MW/sq.m.  Determining precise heat transfer through jet impingement is very complicated, and depends on many factors such as the Reynolds number, the Prandtl number, jet diameter, wall-to-nozzle spacing. Getting bit deeper on the issue, there are three common jet configurations viz. free-surface jet, submerged jet and confined submerged jet.

## Top contributors to discussions in this field

Zol Bahri Razali
Universiti Malaysia Perlis
You can get the similar or apropriate answer by searching the keyword in the GOOGLE SCHOLAR page. Usually you will get the first paper similar to your keyword.
From my experience, this way will help you a lot. If you still have a problem, do not hasitate to let me know.
Kind regards, Dr ZOL BAHRI - Universiti Malaysia Perlis, MALAYSIA
Chaitanya Bharathi Institute of Technology
Common fan sizes include 40, 60, 80, 92, 120, and 140 mm. 200, 230, and 250 mm fans are sometimes used in high-performance personal computers.The adjacent illustration shows a single fan versus two fans in parallel with a maximum pressure of 0.15 inches of water and a doubled flow rate of about 72CFM.To determine flow rate through a chassis, dding a second fan provided marginal improvement with the flow for both configurations being approximately 27-28CFM.
Majid Zarif
first you should assume the mass flow rate and you should know what is the max available surface temperature you can calculate your first value of mass flow rate by the balance of heat rate and assume inflow and outflow temp.after adding the boundary conditions such as the heat rate and inflow temperature and... after convergence of residuals you can know the Temperature distribution on your CPU the max temperature of CPU after that if the max surface temp is upper that the available value you should increase the mass flow rate and if not you should decrease it
Amer Al-ani
(University of Anbar - Iraq)
thanks for everyone.