An energy cost minimizing strategy for fermentation dissolved oxygen control

Shields, R. W.; Kao, E. I.

doi:10.1007/bf00393391

Cited by 8 publications

(2 citation statements)

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“…Following Shields and Kao's energy cost analysis again, the energy cost of foam breakage would be an unacceptable three orders of magnitude greater than the energy cost for aeration and agitation. [11] Dedhia et al . were the first to pay particular attention to the horn dimensions and started to consider the liquid drainage rate in addition to basic measurements of foam breakage.…”

Section: Introductionmentioning

confidence: 98%

“…Following Shields and Kao's energy cost analysis of fermentation, it can be estimated that the energy cost of Dorsey's foam breaker would be commensurate with the energy cost for aeration and agitation. [11] However, the air flow required for the generator was typically an order of magnitude greater than the aeration flow rate. The energy field of the breaker appeared to be a function of the ultrasonic frequency with 26 and 29 kHz giving a wider field of breakage than 34 kHz.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of ultrasound foam interactions

Winterburn

Martin

2009

Asia-Pacific J Chem Eng

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An experimental investigation into the effects of two frequencies of low-power ultrasound on detergent (Teepol) stabilised air-water foams is presented. Foam was subjected to ultrasound at 28 and 40 kHz with a powerto-foam volume ratio of approximately 3 W l −1 with particular consideration being given to the acoustic impedance discontinuity between air and water. The foam height, liquid drainage and collapse behaviour were compared to experiments conducted without ultrasound. In the case of 40 kHz ultrasound, an increased liquid drainage rate was observed and a pronounced increase and subsequent peak in mean liquid hold-up, which occurred at 4 min, was observed. These results appear to be independent of the initial liquid hold-up of the foam. Liquid drainage and mean liquid hold-up results were related to foam collapse mechanisms of homogeneous rupture (HR) and rupture front breakage (FR), concluding that rupture front breakage dominates the collapse of foam under the influence of 40 kHz ultrasound. 

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%