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Investigating and understanding fouling in a planar setup using ultrasonic methods
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10.1063/1.4753992
/content/aip/journal/rsi/83/9/10.1063/1.4753992
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4753992

Figures

Image of FIG. 1.
FIG. 1.

Electrical circuit to describe the system transducer (1)—delay line, (2)—wall, (3)—fouling, (4) with resistors R i , capacitors C i , voltage U i , and current I i of every subcircuit i.

Image of FIG. 2.
FIG. 2.

Mechanical circuit of the system transducer (1)—delay line, (2)—steel wall, (3)—fouling, (4) using springs E i , dashpots η i , stress σ i , and strain ɛ i for every subcircuit i.

Image of FIG. 3.
FIG. 3.

Three port notation of an ultrasonic transducer. (a) The forces F 1,2 and velocities v 1,2 at the surfaces of the transducer with area A and thickness l are connected with the electrical port (voltage V, current I ). (b) KLM model with capacitance C 0 , reactance X 1 , and transformer (ratio 1:N) from the electrical to the mechanical part.

Image of FIG. 4.
FIG. 4.

Used ports for description of the equivalent circuits: Setup with fouling.

Image of FIG. 5.
FIG. 5.

Sketch of the flow channel where fouling is produced with the ultrasonic detection unit.

Image of FIG. 6.
FIG. 6.

Fouling made in developed setup.

Image of FIG. 7.
FIG. 7.

(a) Typical signal of the ultrasonic transducer on the planar measuring section. The echo used for analysis is framed. (b) Short time energy (STE) with standard deviation for different pumping rates measured at different days. STE does not differ strongly.

Image of FIG. 8.
FIG. 8.

(a) STE of different solid couplings used between delay line and planar channel. The silicone foil (Si) with 60 °SH and thicknesses of 0.3 mm and 0.5 mm showed highest STE but Aqualene (Aq) displayed better heat and mechanical stability (all results with standard deviation). (b) PEEK, PMMA, and a PMMA cylinder filled with water were used as delay line. PMMA showed highest STE (with standard deviation).

Tables

Generic image for table
Table I.

Parameters used for the sensitivity analysis of the electrical circuit.

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Table II.

Parameters used for the sensitivity analysis of the mechanical circuit.

Generic image for table
Table III.

Comparison of different fluid dynamic parameters.

Generic image for table
Table IV.

Ranking of the weights from the sensitivity analysis for the electrical circuit.

Generic image for table
Table V.

Ranking of the weights from the sensitivity analysis of the mechanical circuit.

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/content/aip/journal/rsi/83/9/10.1063/1.4753992
2012-09-26
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Investigating and understanding fouling in a planar setup using ultrasonic methods
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4753992
10.1063/1.4753992
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