THE EFFECT OF TASK AND SONIC TREATMENT ON THE TREATABILITY OF DOUGLAS FIR AND SOUTHERN PINE...
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THE EFFECT OF TASK AND SONIC THE EFFECT OF TASK AND SONIC TREATMENT ON THE TREATABILITY TREATMENT ON THE TREATABILITY OF DOUGLAS FIR AND SOUTHERN OF DOUGLAS FIR AND SOUTHERN PINE HEARTWOOD PINE HEARTWOOD Mike Barnes, Mississippi State University and John Simonsen, Oregon State University College of Forestry Oregon State University
Transcript of THE EFFECT OF TASK AND SONIC TREATMENT ON THE TREATABILITY OF DOUGLAS FIR AND SOUTHERN PINE...
THE EFFECT OF TASK AND SONIC THE EFFECT OF TASK AND SONIC TREATMENT ON THE TREATMENT ON THE
TREATABILITY OF DOUGLAS FIR TREATABILITY OF DOUGLAS FIR AND SOUTHERN PINE AND SOUTHERN PINE
HEARTWOODHEARTWOOD
Mike Barnes, Mississippi State University and John Simonsen,
Oregon State University
College of ForestryOregon State University
FLOW DURING TREATMENTFLOW DURING TREATMENT
Pinside
P = Poutside - Pinside
Poutside
DARCY’S EQUATIONDARCY’S EQUATION
L
PAKQ
A
flow
L
P1 P0
PRESSURE DIFFERENTIALPRESSURE DIFFERENTIAL
Hydraulic pressure–gear pump–piston pump–air compressor
Time, msec
0 25 50
Pre
ssur
e, p
si
0
50
100
SONIC WAVE
FREQUENCY = 20 CYCLES/SEC
SCHEMATIC OF SCHEMATIC OF TREATMENT PROCESSTREATMENT PROCESS
Cylinder: 18” X 10’
Fill tank
MTS sonic generator
Gauge tank
Fill and drain pump
Solenoid valve
Level sensor
Computer control and data recording
Vacuum pump
Air pressure
TREATMENT CHARGETREATMENT CHARGE
Sample = 2X4 (9pine), or 2X6 (fir)- 2’
Ten samples each chargeWeigh each sample before and after
Adjust for uptake while fillingMatched samples for sonic and conventional
EXPERIMENTS COMPARING EXPERIMENTS COMPARING AVERAGE PRESSUREAVERAGE PRESSURE
We performed experiments comparing treatments at the same average pressure, but with a sonic pressure wave superimposed on the the conventionally applied (air in the gauge tank) pressure
In this case, the average sonic pressure is zero
EXPERIMENTS COMPARING AVERAGE PRESSUREEXPERIMENTS COMPARING AVERAGE PRESSURE
Air pressure
Air pressure
sonic pressure
conventionalsonic
pressure
0 psi
70 psi
50 psi
Pine, treated at nominal 70 psi,
sonic treatment vs. conventional
Time, min
0 20 40 60 80 100 120 140
Ab
sorp
tion
, kg
/m3
0
50
100
150
200
250
300
350
conventionalsonic
Sonic + TASK treated wood vs. conventional treatment
Southern pine
Time, min
0 20 40 60 80 100 120 140
Ab
sorp
tion
, kg
/m3
0
50
100
150
200
250
300
350
controlsonic + task treated
TASK pre-treated pine vs. conventional treatment
Time, min
0 20 40 60 80 100 120
Abs
orpt
ion,
kg/
m3
-50
0
50
100
150
200
250
300
350
conventionalTASK pretreatment
Sonics vs. conventional at equal applied conventional pressure - Test 1
Time, min
0 20 40 60 80 100 120 140
Ab
sorp
tion
, kg
/m3
0
20
40
60
80
100
120
conventionalsonic
Test 2
Time, min
0 20 40 60 80 100 120 140
Abs
orpt
ion,
kg/
m3
0
20
40
60
80
100
120
140
160
conventionalsonic
Comparing treatments at the peak pressureComparing treatments at the peak pressure
Treating plants must be designed to withstand the maximum pressure, not the average pressure. Thus we performed experiments comparing the pressure at the peak of the sonic wave vs. the same pressure for conventional treatment.
COMPARISONS AT PEAK COMPARISONS AT PEAK PRESSUREPRESSURE
Air pressure
Air pressure
sonic pressure
conventionalentional
sonicpressure
0 psi
60 psi
100 psi
Average conventional treatment vs.peak pressure sonic treatment
Time, min
0 20 40 60 80 100 120 140
Abs
orpt
ion,
kg/
m3
-60
-40
-20
0
20
40
60
80
100
conventionalsonic
Conventional treatment vs.Peak sonic treatment - test 2
Time, min
0 20 40 60 80 100 120 140
Abs
orpt
ion,
kg/
m3
0
20
40
60
80
100
120
140
160
conventionalsonic
CONCLUSIONSCONCLUSIONS
Sonic treatment not effective on pine or fir
TASK treatments effective on fir, but not pine
Comparison at peak pressures shows sonic treatment less effective than conventional treatment
PLANS FOR THE FUTUREPLANS FOR THE FUTURE
Higher frequencies, pressuresHybrid hydraulic/sonic treatment
Cooperative study on Douglas-fir with MSU
Southern pine heartwoodOther refractory species
