Corrosion Fouling: Liquid Side

Somerscales, E. F. C.

doi:10.1007/978-94-009-2813-8_40

Cited by 7 publications

(2 citation statements)

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“…The amplitude of the fluctuation (A), a parameter of potential fluctuation, is affected by shear stresses of the tube wall. Figure 11 Some studies on sinusoidal fouling curves in the literature include: (i) fouling data for an extended surface heat exchanger and a mass accumulation probe used in a diesel exhaust environment [20]; (ii) corrosion fouling [21]; (iii) magnetite particulate deposition from water flowing in aluminum tubes using an X-ray technique [22] as shown in Figure 12A; and (iv) the cooling tower water fouling performance of two types of brazed-plate heat exchangers (BPHEs) [23] in Figure 12B. The curve of Tube 2 can be correlated by a sinusoidal function, R f = Asin(λt) = 2.6 × 10 5 sin(0.0072t).…”

Section: Development Of Potential Fluctuation In the Temporal Dimensionmentioning

confidence: 99%

“…Some studies on sinusoidal fouling curves in the literature include: (i) fouling data for an extended surface heat exchanger and a mass accumulation probe used in a diesel exhaust environment [20]; (ii) corrosion fouling [21]; (iii) magnetite particulate deposition from water flowing in aluminum tubes using an X-ray technique [22] as shown in Figure 12A; and (iv) the cooling tower water fouling performance of two types of brazed-plate heat exchangers (BPHEs) [23] in Figure 12B. Some studies on sinusoidal fouling curves in the literature include: (i) fouling data for an extended surface heat exchanger and a mass accumulation probe used in a diesel exhaust environment [20]; (ii) corrosion fouling [21]; (iii) magnetite particulate deposition from water flowing in aluminum tubes using an X-ray technique [22] as shown in Figure 12A; and (iv) the cooling tower water fouling performance of two types of brazed-plate heat exchangers (BPHEs) [23] in Figure 12B. As one can see in Figure 12B, the wave asymptotic fouling curves for the fouling resistance of cooling tower water in two different brazed-plate heat exchangers (BPHE-1 and BPHE-2, each with a different plate surface) have the same values for λ because λ is not a function of the geometric parameters.…”

Section: Development Of Potential Fluctuation In the Temporal Dimensionmentioning

confidence: 99%

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Analysis of Potential Fluctuation in Flow

2022

Processes

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Understanding the physics of flow instabilities is important for processes in a wide range of engineering applications. Flow instabilities occur at the interfaces between moving fluids. Potential fluctuations are generated at the interfaces between two moving fluids based on the relationship of continuity. Theoretical analysis demonstrated that, in flow instabilities, potential fluctuation exhibits a potential oscillatory wave surface concurrently in the temporal and spatial dimensions. Potential fluctuations already internally exist in flow before flow instabilities begin to develop; these potential fluctuations greatly affect the formation of interpenetrating structures after forces act on the interfaces. Experimental studies supported the theoretical study: Experiments visualizing condensation flows using refrigerant in one smooth tube and one three-dimensional enhanced tube were conducted to show the development of potential fluctuation in spatial dimensions, and an experiment with cooling tower fouling in seven helically ridged tubes and one smooth tube were conducted to show the development of potential fluctuation in the temporal dimension. Both experimental studies confirmed that potential fluctuation was determined by the densities and velocities of the two fluids in the instability as indicated by the relationship of continuity. In addition, the results of numerical simulation in the literature qualitatively confirm the theoretical study. This paper is a first attempt to provide a comprehensive analysis of the potential fluctuation in flow.

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