adiabatic wall temperature

adiabatic wall temperature

[¦ad·ē·ə¦bad·ik ′wȯl ‚tem·prə·chər]
(fluid mechanics)
The temperature assumed by a wall in a moving fluid stream when there is no heat transfer between the wall and the stream.
References in periodicals archive ?
To account for the strong dependence on temperature, a viscosity ratio was used in Equation 5, in which [[micro].sub.w] is the dynamic viscosity based on wall temperature and [[micro].sub.aw] is the dynamic viscosity based on adiabatic wall temperature. The adiabatic wall temperature is an estimate of the oil temperature near the impingement area, taking into account viscous dissipation in the high Prandtl oil jet as it approaches the stagnation zone at the piston surface.
where h is convective heat transfer coefficient, [T.sub.w] is the local wall temperature and [T.sub.aw] is the adiabatic wall temperature, which is used in place of the free stream fluid temperature.
The piston surface temperature, [T.sub.w], was an area-weighted undercrown temperature, and the adiabatic wall temperature (jet temperature) was determined using Equation 10.
[T.sub.aw] - adiabatic wall temperature, [degrees]C
Steady-state liquid crystal experimental method was used for measuring the film cooling effectiveness ([eta]) which is related to the adiabatic wall temperature ([T.sub.aw]) through the relation
To obtain the adiabatic wall temperature ([T.sub.aw]), a guard heater was attached to the bottom side of the endwall plate.
It should be also pointed out that a fitted value to measured adiabatic wall temperature for a typical case does not change the computed value of heat transfer coefficients.