The Effect of Boiling on the Mass Transfer of Corrosion Products in High Temperature, High Pressure Water Circuits

Nicholson, Frank; Sarbutt, J. V.

doi:10.5006/0010-9312-36.1.1

Cited by 10 publications

(4 citation statements)

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“…It was proposed by Nicholson and Sarbutt,27 Hussain et al,28 and Turner and Klimas29 that deposit consolidation experienced by scales formed under high temperatures on the boiling surface might result in an increase in the bond strength of the deposit, making it hard to remove with low shear forces. Consolidation is a process in which particles are attached to the heat transfer surface or preexisting deposit by chemical bonding.…”

Section: Resultsmentioning

confidence: 99%

Effect of thermohydraulic conditions on fouling of calcium oxalate and silica

Yu¹,

Sheikholeslami²,

Doherty³

2005

AIChE Journal

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Section: Resultsmentioning

confidence: 99%

Effect of thermohydraulic conditions on fouling of calcium oxalate and silica

Yu¹,

Sheikholeslami²,

Doherty³

2005

AIChE Journal

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“…The corrosion products deposited preferentially on fuel element surfaces because reactor water bolled on them. 3,4 The corrosion products are activated by neutron radiation while on the surface, and some of the activated corrosion products may be released into the reactor water. This release is considered to be the main transfer process of radioactivity in reactor water circuits.…”

Section: Discussionmentioning

confidence: 99%

“…Nicholson reported the same phenomenon for the zircaloy tube as the boiling surface. 4 In fact, plotting the amount In the middle section of the bar, where the increase of the local heat flux is of minor influence, the increase of the deposition rate was actually less. Hence, it will be reasonable to consider that the increase in the apparent deposition rate at this stage is attributed to the experimental device and the deposition process does not change.…”

Section: Deposition Ratementioning

confidence: 95%

Deposition Rate of Suspended Hematite in a Boiling Water System under BWR Conditions

Mizuno¹,

Wada²,

Iwahori³

1982

CORROSION

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The state and rate of deposition of suspended hematite ware studied on a bolling heat transfer surface under the heat flux, temperature, and pressure similar to those In BWR power plants. As the depositlon proceeded, the deposition state changed from hemispheric deposits at the bolling sites, through their coalescence and lamination, to a flat deposit covering the bolling surf ace. This deposit contained a lot of water and had a number of pores from which steam bubbies emerged. Before reaching the break point, the amount of deposit (w) is expressed as a function of hematite concentration (c), heat flux (q), heat of evaporation (r), and time (t): w = 0.17 (glr)18ct. Once the amount of deposit reached 2-4 mg/cm 2, the apparent depositlon rate decreased sharply. The amount of deposit at this point decreased with the lowering of the hematite concentration and Increased with a rise In the heat flux. If the amount of deposit can be held below the break point during fuel element operation, the radioactive corrosion products level is expected to reduce considerably in reactor water. AbstractFatigue crack growth rate has been studied in an X65 pipeline steel, submerged in crude oil containing hydrogen sulfide in concentrations from 30 ppm to saturation. The studies provide data needed to estimate the corrosion fatigue life of flawed structures operating in "sour" crude oil. The results show that crack growth rate in crude oil is a functionof hydrogen sulfide content. The effect of cyclic frequency in the range 0.1 to 10 Hz is minor and can be neglected.

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“…Thomas and Grigull, however, attributed the increase to a higher fluid turbulence and mass transport to the surface with the onset of boiling. Nicholson and Sarbutt conducted loop fouling tests under BWR conditions, and observed higher fouling rates of hematite particles on surfaces in boiling heat-transfer compared to heat-transfer without boiling [90]. Like Thomas and Grigull, they also observed an increase in deposition rate with decreased sub cooling.…”

Section: Impact Of Boiling On Rate Of Particulate Foulingmentioning

confidence: 95%