Principle And Practice Of Hotwire Constant Temperature ...

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11 th Israeli Symposium on Jet Engines and Gas Turbines, October 2012 Technion, Israel Sensitivity Analysis Logarithmic differentiation of Nu gives: Re f ( , U , T 0 ) M f( U , T 0 ) (Re, M, ) 1 logNu 1 log S 2logRe logRe 1 logNu 1 log Su S + 2 logM logM K 1 1 S K1n mS S S T0 t t u Aw 2 2 11log logNu S 2 K logRw logTw A logR logI w e' ρ' u' = S ρ + S u + S ' E ρ U w nt logk logT0 m log logT t 0 e' 1 ρ' E 1 S1 Sρ1 Su1 ρ - '= e' S S 2 ρ2 S u2 u' E 2 U ∆ [S ρ /S u ] with ∆ is limited to 8 % [ ] ill-conditioned ∆ [S ρ /S u ] with ∆d wire = 5μm to 9 μm up to 20 % Instantaneous Density AND Velocity Fluctuations can be Computed
11 th Israeli Symposium on Jet Engines and Gas Turbines, October 2012 Technion, Israel Why Should You Care RTD 5-Hole Probe X-wire X-wire 5μm wire (~60kHz @M=0.8)
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