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(top) A micrograph of the cellulose tube showing MB aggregation retained near the pressure null. (middle) Schematic describing how the PRF causes MB aggregation and translation towards the opposite tube wall. The engendered TF directly opposes the flow direction thus trapping MB clusters. (bottom) Simulated (dotted line) and measured (continuous line) lateral PNP at the focal depth. The face of the linear array is parallel to the tube axis and the pressure null is aligned to its centre.
In the series of micrographs (a)–(f) the flow rate and concentration were 50 ml/h and 40106 MB/ml, respectively. The vertical dotted lines at the centre of each micrograph represent the pressure null. (g) A plot of the largest trapped cluster diameter (dotted line) and position (continuous line). The centre frequency was 7 MHz, the pulse repetition frequency 10 kHz, the PNP of 500 kPa, = 71, and = 0.5.
Maximum cluster diameter and accumulation duration for an increasing flow rate Q. The ultrasound parameters were constant with a centre frequency of 7 MHz, a pulse repetition frequency of 10 kHz, a PNP of 350 kPa, = 57, and = 0.5. The MB concentration was 40106 MB/ml.
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