[Gasification] heat exchanger flow

[Oscar]

Hi Toby and gasification colleagues.

 

Reading your latest post there is something that took my attention, and it
is the terms on which we are addressing the heat transfer process. You said
that turbulence causes resistance to flow...then. what flow are your
referring to..fluid flow, heat flow.?????

When talking on heat transfer process we are referring to those resistances
which do not allow heat to be transferred from one fluid to another in which
the boundary layer phenomena highly contributes in slowing down the heat
transfer rate. Also the material of the solid boundary throw which the heat
is transferred is important etc. 

Again I suggest consulting Perry's handbook for getting a quick and easy
picture of the turbulence role in heat transfer. 

 

Kindest regards

 

Oscar.

 

    

 

  _____  

De: Toby Seiler [mailto:seilertechco at yahoo.com] 
Enviado el: martes, 18 de septiembre de 2007 14:21
Para: oscar at geprop.cu
CC: gasification at listserv.repp.org
Asunto: heat exchanger flow

 

Oscar, Jim and list,

 

Turbulence in flow is not going to improve heat transfer.  Is it possible
the term has been misapplied?  Turbulence causes resistance to flow.  Wiping
the surface with lots of molecules moves the heat along.  If you restrict
the flow, there are less molecules to do the transfer thing.  Please provide
a reference so I can understand what may be referred to as "turbulent" flow
versus "swirl" or convoluted flow path in heat exchange.

 

Regards,  Toby Seiler

  

  _____  

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