Comparison of sonoluminescence in Water and Sulfuric Acid Kh. Imani, M. Silatani, R. Rezaei -...
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Transcript of Comparison of sonoluminescence in Water and Sulfuric Acid Kh. Imani, M. Silatani, R. Rezaei -...
Comparison of Comparison of sonoluminescence in sonoluminescence in
Water and Sulfuric AcidWater and Sulfuric Acid
Kh. Imani, M. Silatani, R. Rezaei-Nasirabad,
A. Moshaii, R. Sadighi-Bonabi,
History:History:• 19341934 Bath Ultrasound by H. Frenzel &H. Schultes(MBSL)(MBSL)• 19891989 F. Gaitan (SBSL)(SBSL)
• 20052005 F. Flannigan & S. Suslick ( H2SO4)( H2SO4)
Hydrodynamics model:
Bubble dynamics:
boundary condition of pressure and Van der waals equation of
gas:
ρ
P-PPCR
1PPdtd
ρCR 0al
al
2
31
2
31 R
C
RRR
C
R
RR
RPP gl
24
BNV
kTNP
tot
totg
,exp
1
1/exp ,,,
,
gB
jfcgBAtotjf
t
tot
tottotjf TK
ETnnnk
Bn
BnBnr jf
j
,exp ,,,
,
gB
jbcgCCtotjbjb TK
ETnnnkr jf
jbjfj rrr ,, ., jjij
ci rVN
Chemical reaction:
14/17
.222 OOOHHHOHArtot NNNNNNNN
.min,4 ,2
R
R
RDl
l
nnDRN d
d
iiodi
Mass transfer at the bubble wall:
The bubble contents is assumed to be: ( Nobel gas+H2O+ Reaction products )
0N
particlesother allfor 0n
TkPn
dAr
i0,
lB
vOH0, 2
,4 2
th
gl
l
TTRQ
R
R
Rlth ,min
Heat transfer at the bubble wall:
pC
Conductivity coefficientConductivity coefficient:pC Heat ConductionHeat Conduction::
Instability conditions of bubble:
Shape Instability (Sh-S)
Diffusion Instability (D-S)
Bjerknes Instability (Bj.thr.)
With regard to computed phase diagrams, we chose the junction point (Pa, R0) of D-S curve with other stability curves
CalculationCalculation
ExperimentalExperimental
A. Troia, et. al, Ultrasonic sonochemistry—13(2006-)278