Upcoming Meetings & Conferences

The Netherlands

TNO - Implementation of PI Technologies

15 April - 2011


EUROTHERM Seminar 92

17-21 April - 2011


INFUB, Industrial Furnaces & Boilers

26-29 April - 2011

The United Kingdom

IChemE – European Process Intensification Conf

20-23 June - 2011


MNF2011, 3rd Micro and Nano Flows Conference

22-24 August - 2011

The United Kingdom

UK Heat Transfer Conference

30 August - 1 September - 2011


8th Int. Seminar on Heat Pipes, Heat Pumps etc.

12-15 September - 2011

Observations from Fred Starr

I am about half way through my paper on "Internal Cooling of Exhaust Valves in IC Engines". I managed to get hold of some wartime tests in which water was flowed through an exhaust valve of a big American radial engine. The heat input was quite high, more than 3kW, into a few square inches.Valve temperatures droped from over 700 to less than 200 deg C.

I then used this data to assess some First World War tests by the RAE, who partially filled a valve stem with water, and used what is now called the "thermosyphon" effect to transfer heat from the valve crown to the top of the stem. Calculations also suggest very high heat transfer rates. I suspect that the high accelerations and decelerations, resulting from the reciprocating motion of the valves, affected the boundary layers, and this helped... Quite possibly the condensation heat transfer rate could have approached droplet rates.

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