Water movement in porous building materials—VIII. Effects of evaporative drying on height of capillary rise equilibrium in walls

I'Anson, Stephen; Hoff, W D

doi:10.1016/0360-1323(86)90030-2

Cited by 36 publications

(18 citation statements)

References 4 publications

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“…In such systems, capillary pressure plays a crucial role in determining the motion of fluids within the porous media. [1][2][3][4][5][6][7][8] In addition, temperature variation may affect such flows where the hydraulic properties of the porous media such as hydraulic conductivity and water retention are temperature dependent. [9][10][11][12] Conventional approaches for modeling of immiscible two-phase flow in porous media involve the use of an extended version of Darcy's law 3,13,14 for multiphase flows in conjunction with the use of constitutive relationships between capillary pressure, saturation, and relative permeability (P c -S-K r ) based on quasi-static conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic effects on capillary pressure–Saturation relationships for two‐phase porous flow: Implications of temperature

Hanspal

Das

2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Work carried out in the last decade or so suggests that the simulators for multiphase flow in porous media should include an additional term, namely a dynamic coefficient, as a measure of the dynamic effect associated with capillary pressure. In this work, we examine the dependence of the dynamic coefficient on temperature by carrying out quasi-static and dynamic flow simulations for an immiscible perchloroethylene-water system. Simulations have been carried out using a two-phase porous media flow simulator for a range of temperatures between 20 and 80 C. Simulation domains represent 3-D cylindrical setups used by the authors for laboratory-scale investigations of dynamic effects in two-phase flow. Results are presented for two different porous domains, namely the coarse and fine sands, which are then interpreted by examining the correlations between dynamic coefficient(s) and temperature, time period(s) required for attaining irreducible water saturation, and the dynamic aqueous/nonaqueous phase saturation and capillary pressure plots. The simulations presented here maintain continuity from our previous work and address the uncertainties associated with the dependency of dynamic coefficient(s) on temperature, thereby complementing the existing database for the characterization of dynamic coefficients and subsequently enabling the users to carry out computationally economical and reliable modeling studies.

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Section: Introductionmentioning

confidence: 99%

Dynamic effects on capillary pressure–Saturation relationships for two‐phase porous flow: Implications of temperature

Hanspal

Das

2011

AIChE Journal

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“…However the results highlight that MC% data do not follow a linear model, even considering interaction effects. On the data collected from multiple building assets the physical laws and models reported in literature, which regards small samples, single masonries or single buildings studied under controlled conditions [1,4,7,9,10], do not apply straightforward. The data show complex structure, that need to be investigated with a non-linear approach such as the regression tree.…”

Section: Discussionmentioning

confidence: 99%

“…Rising damp phenomena in porous materials have been diffusely studied and described from the point of views of the physics laws, as for example the rise of water within single capillary tubes (Jurin Law), or in more complicated structures [1,7,12,29]. In masonries, the maximum height reached by rising damp and the necessary time to reach the steady state vary according to several factors, such as mortar joint types, the presence of renders, the surrounding environment.…”

Section: Rising Damp and Venetian Buildings: A Literature Reviewmentioning

confidence: 99%

“…In masonries, the maximum height reached by rising damp and the necessary time to reach the steady state vary according to several factors, such as mortar joint types, the presence of renders, the surrounding environment. According to L'Anson et al, 1986 [7] the maximum height of the moisture frontgiven by the balance point between the water coming from rising damp and the water evaporated from the wall -is reached in different span of times accordingly the relative humidity (RH). The balance point in rendered walls is at 1.3 m and it is reached in around 8 years with a 80% relative humidity (RH), and in 18 years with a 90% RH environment.…”

Section: Rising Damp and Venetian Buildings: A Literature Reviewmentioning

confidence: 99%

“…Soaked masonries often show serious conservation issues. The phenomenon and the resulting decay have been extensively studied [1][2][3][4], as well as possible remediation methods [5,6], both from the theoretical point of view [7][8][9][10][11], and on several real case studies all over the world [2,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Rising damp in historical buildings: A Venetian perspective

Falchi

Slanzi

Balliana

et al. 2018

Building and Environment

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A B S T R A C TConsidering several real case studies, moisture distribution due to rising damp in Venetian brick masonries is discussed and empirical models are developed. Moisture content and soluble salt data of 25 historical buildings in Venice are analysed. Data are scrutinized using statistical methods, obtaining contour plots and estimating the validity of linear and non-linear models. The models confirm that masonries are usually soaked with water till 120-150 cm over sea level, while the evaporation zone ranges in height from 200 cm to 350 cm. In the perpendicular section, moisture distribution depends on several contingent factors such as, among them, the proximity and the exposition of the external façades to the water action.

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Are Copper(I) Carbenes Capable Intermediates for Cyclopropanations? The Case for Ylide Intermediates

Aldajaei

Keeffe

Swift

et al. 2015

Chemistry A European J

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A novel approach is used to synthesize a stable, ligated copper(I) carbene in the gas phase that is capable of typical metal carbenoid chemistry. However, it is shown that copper(I) carbenes generally undergo rapid unimolecular rearrangements including insertions into copper-ligand bonds and Wolff rearrangements. The results indicate that most copper(I) carbenes are inherently unstable and would not be viable intermediates in condensed-phase applications; an alternative intermediate that is less prone to rearrangements is required. Computational data suggest that ylides formed by the complexation of the carbene with solvent or other weak nucleophiles are viable intermediates in the reactions of copper(I) carbenes.

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Water movement in porous building materials—VIII. Effects of evaporative drying on height of capillary rise equilibrium in walls

Cited by 36 publications

References 4 publications

Dynamic effects on capillary pressure–Saturation relationships for two‐phase porous flow: Implications of temperature

Dynamic effects on capillary pressure–Saturation relationships for two‐phase porous flow: Implications of temperature

Rising damp in historical buildings: A Venetian perspective

Are Copper(I) Carbenes Capable Intermediates for Cyclopropanations? The Case for Ylide Intermediates

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