Subject	They are all "cross flow"
Posted by	Brad(RI) on October 15, 2012 at 2:36 PM
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In Reply To	Intercooler design posted by JMartz on October 15, 2012 at 09:34 AM
Message	What you are debating is a single pass vs. two pass heat exchanger. Cross flow refers to the direction of the two fluids. In a cross flow hx they are flowing perpendicular to each other as in your IC, or a radiator etc. Either configuraiton, single pass, two pass, should remove basically the same amount of heat. Increase in fluid velocity will generally increase the heat transfer coefficient, so in the case of 2 pass you will have twice the fluid velocity in the tubes for the same air flow so heat transfer will be somewhat better for the same tube area than a simillar single pass. The other difference will be the pressure drop across the heat exhanger. Obviously, it will be greater in a two pass, more than double actually, than what a single pass of the same dimensions would be. Pressure loss is proportional to fluid velocity squared. So your loss in the tube portion of the HX will be 4 times greater. However, if you had to add a more elbows to plumb it you would be adding some of that resistance back in.
Follow Ups	Intercooler design - JMartz 09:34:58 10/15/12 How will youpackage that ? (n/m) - ztunerz 09:41:02 10/15/12 Easy, one side the same as stock, the other - JMartz 12:33:36 10/15/12 Shhh damnit, i had the same idea, i even measured it up... (n/m) - ztunerz 20:49:45 10/15/12 I know someone has been working on that, maybe they - toykoz32 11:29:05 10/15/12 Re: Intercooler design - Doug71zt(CAN) 12:34:16 10/15/12 A reasonable idear! - JMartz 12:37:29 10/15/12 internal air guides are common on commercial trucks (n/m) - aliaZ 17:16:09 10/15/12 I don't think you're right about the 80/20 thing. Since - zellamay 13:09:20 10/15/12 I have always thought like you but in addition - JMartz 13:22:53 10/15/12 I remember that too, but that has to do with cycles, - zellamay 14:13:54 10/15/12 Equal pressure does not mean equal flow. (n/m) - coma_ass 13:42:25 10/15/12 Explain, please. Seems to me that, at idle, the air - zellamay 14:21:55 10/15/12 Not sure how to properly explain it. - coma_ass 13:14:55 10/16/12 If the IC core is uniform, equal pressure at the entry point - black300zx 16:20:07 10/15/12 Uniform, equal pressure at the entry tank will - JMartz 17:19:17 10/15/12 They are all "cross flow" - Brad(RI) 14:36:13 10/15/12 Sorry bad choice of words. I am not discussing ICs - JMartz 17:29:53 10/15/12
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