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  1. daubery

    Thicker versus thinner radiator core

    That is a strong possibility. The current water volume flow range for a radiator is typically 40 - 80 litre/min for Japanese vehicles. If you know that number of tubes in your radiator, you could work out the tubeside velocity. Reynolds number: Re = density*velocity*Dh/viscosity where: Dh =...
  2. daubery

    Thicker versus thinner radiator core

    JoshMalks wrote: Since I'm told that turbulence in the tubes is important to optimum heat transfer, what do you folks think of dimpled radiator tubes to increase turbulence? desA replies: For a US/Euro radiator (horizontal tubes), the fluid velocity in the tubes is generally designed to have...
  3. daubery

    Thicker versus thinner radiator core

    Reduce radiator depth (thickness), & increase fin density slightly. Work on a louver angle of around 27 - 30 degrees - with louver at >=90% of fin height. Radiators are cross-flow devices & it can be shown that under many flow conditions the air exit temperatures & water temperatures coincide -...
  4. daubery

    Graduate Degree in Engineering?

    Interesting comments, Greg. I'd tend to agree. Post-graduate degrees develop specialist skills in advanced research techniques, & technical writing. That's about the true value of them - to industry. I have returned to academic studies in the latter part of my career, but in parallel to a busy...
  5. daubery

    Copper tubes in domestic HVAC&R coolers?

    I can understand corrosion issues on aluminum fins, but, would this be a problem for aluminum tubes? What I'm thinking of here is the typical automotive aluminum condenser, & why it can't be used in domestic refrigeration applications. Des Aubery... (adTherm Technology)
  6. daubery

    Heat transfer coefficient for a rectangular duct

    Use the hydraulic diameter (D,h) in the equation, as follows: L -> D,h Re = dens * Vel * D,h / visc This should get you to h. From h, compute q. Des Aubery... (adTherm Technology - adthermtech dot com - des@adthermtech dot com)
  7. daubery

    Heat transfer coefficient for a rectangular duct

    elpepe2 wrote: ...heat transfer coefficient for a rectangular duct fluid (air) inside, three of the walls are isolated from the enviroment and the remaining is an isothermal wall. The Reynold number corresponds to a turbulent flow. I begin my calculations considering a flow parallel to a flat...
  8. daubery

    Copper tubes in domestic HVAC&R coolers?

    Thanks 'chilled', >>> I suspect the warrenty issues hurt the manufacturers. Could you perhaps elaborate a little more on this, please. Why should there be warranty issues with aluminium tubes? Des Aubery... (adTherm Technology - adthermtech dot com - des@adthermtech dot com)
  9. daubery

    Fox News Sunday Comments Re: Minneapolis Bridge Failure

    ^ Or pollution... :) Des Aubery... (adTherm Technology - www.adthermtech.com )
  10. daubery

    Graduate Degree in Engineering?

    Most university lecturers couldn't make a go of it in the 'real world'. The world of ivory towers is pretty distant from the rigors & demands of life. The real fun starts when you try & do a PhD later in life - no-one, even the dog, knows what to make of you. :) Des Aubery... (adTherm...
  11. daubery

    Copper tubes in domestic HVAC&R coolers?

    With the very high prices for copper ($6800/ton), and aluminium now at around ($2400/ton), what are the prospects for tubing to change in the condensers & evaporators used in domestic air-conditioning units? I know of some research using aluminium multiport tubes, but I'm not quite sure how far...
  12. daubery

    what does'Trust plate' mean?

    It certainly struck me as meaning "thrust plate". Some of the Asian scholars have tended to mis-pronounce 'thrust' as 'truss', & this has probably carried over. There are a few other quaint ones. :) Des Aubery... (adTherm Technology - www.adthermtech.com )
  13. daubery

    high temperature heat transfer fluid

    Thanks davefitz. That was very informative. Good thing no-one was injured. Des Aubery... (adTherm Technology - www.adthermtech.com )
  14. daubery

    high temperature heat transfer fluid

    A thought. Would a heat-pipe system be useful for this application? If so, it could be an elegant, compact solution. My concern would be the working fluid temperature limit, though. Des Aubery (www.adthermtech.com)
  15. daubery

    Fox News Sunday Comments Re: Minneapolis Bridge Failure

    Does anyone have a reasonable opinion on why the bridge did collapse? It seemed rather spectacular over international TV. Des Aubery (adTherm Technology) Best regards, Des Aubery... (adTherm Technology - www.adtherm.com)
  16. daubery

    Reynolds number at vehicle water radiator

    The airside heat transfer dominates the radiator performance. The equivalent heat-transfer coefficient on the airside is around 150-250 W/m2.K. The coolant generally runs a Reynolds Number greater than 2350 (transition to turbulence). The equivalent heat-transfer coefficient on the coolant...
  17. daubery

    Engineering dept staffed with unqualified "engrs"

    Hi 'Greg', In my experiences as a Technology Executive & Executive Consultant in the Automotive Component Industry, I have seen both kinds of manager... The technically competent leader generally wins hands-down - especially with rapid hitech development... The non-tech manager is a typical...
  18. daubery

    Engineering dept staffed with unqualified "engrs"

    IMHO Engineering Managers need to be skilled Engineers (1st), & skillful Managers (2nd)... I believe that it is a falicy to think that non-technical Managers can 'manage' Engineers towards excellent solutions - without the intuition needed to guide/coach engineers towards the optimum...
  19. daubery

    Radiator Impact test

    Hi 'finman', >>Quote: Is anyone aware of a formal impact test for automotive radiators. >>I know that the frontal area of a radiator can become damged due to careless pressure washing and in some instance impact damage from airborne stones etc as the materials are all relatively soft. I'm...
  20. daubery

    radiators-Aluminum vs. copper

    Hi 'turbododge', >>Quote:The results lead me to believe that how the tubes and fins are laid out, and how dense they are, make more difference than what they are made of. The radiators that had the lesser resistance to airflow, because of less fins and/or thickness, did better at speed because...

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