Evaluation of a steady-state test of foam stability

Hutzler, Stefan; Lösch, Dörte; Carey, Enda; Weaire, D.; Hloucha, Matthias

doi:10.1080/14786435.2010.526646

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…The foaming capacity and stability apparatus used in this study was adapted from similar studies (Ross and Ellis, 1992;Bindal et al, 2002;Hutzler et al, 2011). This test was selected to evaluate the foaminess, or foaming tendency of the liquid as well as the stability of any foam generated.…”

Section: Foaming Capacity and Stability Testingmentioning

confidence: 99%

Impact of narasin on manure composition, microbial ecology, and gas emissions from finishing pigs fed either a corn-soybean meal or a corn-soybean meal-dried distillers grains with solubles diets

Kerr

Trabue

Weelden

et al. 2018

Journal of Animal Science

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An experiment was conducted to determine the effect of feeding finishing pigs a corn-soybean (CSBM) diet or a CSBM diet supplemented with 30% dried distillers grains with solubles (DDGS), in combination with or without a growth-promoting ionophore (0 or 30 mg narasin/kg of diet), has on manure composition, microbial ecology, and gas emissions. Two separate groups of 24 gilts (initial BW = 145.1 kg, SD = 7.8 kg) were allotted to individual metabolism crates that allowed for total but separate collection of feces and urine during the 48-d collection period. After each of the twice-daily feedings, feces and urine from each crate was collected and added to its assigned enclosed manure storage tank. Each tank contained an individual fan system that pulled a constant stream of air over the manure surface for 2 wk prior to air (day 52) and manure sampling (day 53). After manure sampling, the manure in the tanks was dumped and the tanks cleaned for the second group of pigs. Except for total manure Ca and P output as a percent of intake and for manure methane product rate and biochemical methane potential (P ≤ 0.08), there were no interactions between diet composition and narasin supplementation. Narasin supplementation resulted in increased manure C (P = 0.05), increased manure DM, C, S, Ca, and phosphorus as a percent of animal intake (P ≤ 0.07), and increased manure volatile solids and foaming capacity (P ≤ 0.09). No effect of narasin supplementation was noted on manure VFA concentrations or any of the gas emission parameters measured (P ≥ 0.29). In contrast, feeding finishing pigs a diet containing DDGS dramatically affected manure composition as indicated by increased concentration of DM, C, ammonia, N, and total and volatile solids (P = 0.01), increased manure DM, N, and C as a percent of animal intake (P = 0.01), increased manure total VFA and phenols (P ≤ 0.05), decreased gas emissions of ammonia and volatile sulfur compounds (VSC; P = 0.01), increased emissions of phenols and indoles (P ≤ 0.06), decreased methane production rate (P = 0.01), and slight differences in microbial ecology (R ≤ 0.47). In conclusion, feeding a diet which contains an elevated level of indigestible fiber (i.e., DDGS) resulted in more fiber in the manure which therefore dramatically affected manure composition, gas emissions, and microbial ecology, while narasin supplementation to the diet did not exhibit a significant effect on any of these parameters in the resultant swine manure.

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Section: Foaming Capacity and Stability Testingmentioning

confidence: 99%

Impact of narasin on manure composition, microbial ecology, and gas emissions from finishing pigs fed either a corn-soybean meal or a corn-soybean meal-dried distillers grains with solubles diets

Kerr

Trabue

Weelden

et al. 2018

Journal of Animal Science

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“…The later contributions of Gol'dfarb et al [7], Verbist et al [8], Koehler et al [9], Cox et al [10] and Saint-Jalmes & Langevin [11] developed the field in its full generality. This formulation has been applied with qualitative and semi-quantitative success to a range of drainage experiments, including 'free drainage' and 'forced drainage' [12,13], and foamability tests [14] in a single column. (For a more thorough summary of early foam drainage theory, see the work of Weaire et al [13].…”

Section: Introductionmentioning

confidence: 99%

A model system for foam fractionation

et al. 2013

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A model system for theory and experiment that is relevant to foam fractionation consists of a column of foam moving through an inverted U-tube between two pools of surfactant solution. The foam drainage equation and its variants are used for a theoretical analysis of this process. In the limit in which the lengths of the two legs is large (L → ∞), exact analytic formulae may be derived for the key properties of the system. Numerical computations and experiments support these results.

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“…In polydisperse foams the value of φ ⋆ l decreases only slightly from 0.36 for the modest polydispersities which are typically obtained from many experimental foaming techniques [13,14] The steady-state height of the foam column as a function of the bubble velocity is determined by applying proper boundary conditions for the liquid fraction at the bottom (h f = 0) and top (h f = h) of the foam column. If the bubbles at the bottom of the column are in contact with a pool of liquid, their packing will resemble that of a dense packing of hard spheres, and therefore the liquid fraction at the bottom is set to φ(h f = 0) = φ 0 ≈ 0.36 and at the top to φ(h f = h) = φ h , where φ h is a finite critical liquid fraction below which the films collapse [15]. This value must be determined by experimental observation.…”

Section: Measurable Foam Propertiesmentioning

confidence: 99%

Experimental study on the rise of aqueous foams in vertical pipes

Salazar

Sigalotti

Ovando

et al. 2022

Preprint

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In this paper we report experiments on the growth of dry foams and their rise in thin vertical pipes of different circular cross-sectional radii. Air injection at the bottom of the pipes is performed at a constant flow rate by means of a single capillary tube. The formation and rising of the foam was investigated for two different cases: (a) when the top cap of the vertical pipes is open and (b) when it is closed. We find that the position and velocity of the foam front as well as the foam dispersivity are both dependent on the pipe diameter and on whether its top end is open or capped. When the top is open, the foam column grows faster compared to the case when it is sealed. In pipes of small diameters, the growth rate is nonlinear and faster than in pipes of large diameters in which cases the foam rises at an almost constant rate. As the diameter of the pipe increases, the size of the produced bubbles also increases. In closed-top pipes the foams tend to be more homogeneous than in open top pipes. The experimental observations indicate that under foam drainage driven by gravity, the liquid flow velocity across the Plateau borders is indicative of a drainage model based on a plug-like flow in channels with fully mobile interfaces, where viscous dissipation occurs only in the nodes.

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Evaluation of a steady-state test of foam stability

Cited by 29 publications

References 22 publications

Impact of narasin on manure composition, microbial ecology, and gas emissions from finishing pigs fed either a corn-soybean meal or a corn-soybean meal-dried distillers grains with solubles diets

Impact of narasin on manure composition, microbial ecology, and gas emissions from finishing pigs fed either a corn-soybean meal or a corn-soybean meal-dried distillers grains with solubles diets

A model system for foam fractionation

Experimental study on the rise of aqueous foams in vertical pipes

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