1,668 research outputs found
Dataset for "Experimental investigation of scalar dispersion in indoor spaces"
No full textData supports: H.D. Lim, Timothy G. Foat, Simon T. Parker, Christina Vanderwel, Experimental investigation of scalar dispersion in indoor spaces, Building and Environment, 2024, 111167, ISSN 0360-1323,
https://doi.org/10.1016/j.buildenv.2024.111167
(https://www.sciencedirect.com/science/article/pii/S036013232400009X)
This dataset contains PIV-PLIF experimental data in the folder. Readme files are provided in the zip folder explaining the data fields and how to interpret them. The data files are in .mat format. </span
Dataset for "On the effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in indoor spaces"
No full textData supports: H.D. Lim, Timothy G. Foat, Simon T. Parker, Christina Vanderwel, On the effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in indoor spaces, Building and Environment, 2024, 111649, ISSN 0360-1323,
https://doi.org/10.1016/j.buildenv.2024.111649
(https://www.sciencedirect.com/science/article/pii/S0360132324004918)
This dataset contains PIV-PLIF experimental data in the folder. Readme files are provided in the zip folder explaining the data fields and how to interpret them. The data files are in .mat format. </span
Touching Freud's dog: H.D.'s tactile poetics
No full text"Do not touch me", Frau Emmy warns Freud in 1889. "Do not touch", Freud echoes in 1933. This time, he is referring to his pet chow, Yofi, warning H.D. that "she snaps - she is very difficult with strangers". Examining the prohibition in light of work by Jacques Derrida and Jean-Luc Nancy, this article charts the withdrawal that always interrupts touch. Despite Freud's taboo, however, H.D.'s writing seeks to make contact in strange and unnerving ways. Developing Julia Kristeva's account of the semiotic, this paper proposes a literature of touch. Reading H.D.'s poems, alongside Tribute to Freud, and her letters, the author demonstrates that H.D.'s poetics are always haunted by the very (im)possibility of contact
Application of turbulent diffusivity models to point-source dispersion in outdoor and indoor flows
No full textThe modelling and prediction of scalar transport in turbulent flows is crucial for many environmental and industrial flows. We discuss the key findings of our experimental campaigns which focus on two relevant applications: the scalar dispersion of a ground-level point-source in (1) a smooth-wall turbulent boundary layer flow and (2) a supply-ventilated empty room model. For advection-dominated outdoor flows, we show how a Gaussian Plume Model provides a good framework to describe the mean scalar field and discuss its limitations in (wrongly) assuming a constant turbulent diffusivity. For indoor flows, we explore the balance of the advective and turbulent fluxes and their dependence on the room geometry and source position. We use our improved understanding on the scalar transport mechanism in these applications to assess the application of turbulent diffusivity models to predict scalar dispersion, highlighting the importance of carefully defining what the eddy diffusivity coefficient encompasses in different approaches
Turbulent dispersion of a passive scalar in a smooth-wall turbulent boundary layer
No full textThe scalar dispersion of a ground-level point-source plume in a smooth-wall turbulent boundary layer is experimentally investigated using simultaneous particle image velocimetry and planar laser-induced fluorescence techniques. In the near-source region, the viscous sublayer is observed to trap dye, while in the far field, the half-width, vertical profiles and peak decay of the mean concentration and concentration variance exhibit self-similar behaviour and collapse with empirical relations. Full two-dimensional maps of the turbulent scalar fluxes show a net transport direction of upward and towards the incoming flow, with the vertical profiles collapsing well with Weibull-type exponential functions and the decay of peaks following power laws. Using the first-order gradient transport to model the turbulent scalar fluxes, maps of the anisotropic turbulent diffusivity tensor and an effective turbulent diffusivity coefficient are calculated. The streamwise and wall-normal turbulent scalar fluxes are driven dominantly by the wall-normal concentration gradient. The turbulent Schmidt number, relating the turbulent diffusivity and the turbulent (eddy) viscosity calculated using the Boussinesq hypothesis, varies with wall-normal position with values of the order of unity in the logarithmic layer
Dataset supporting the publication "Turbulent dispersion of a passive scalar in a smooth-wall turbulent boundary layer"
No full textDataset supporting the publication "Turbulent dispersion of a passive scalar in a smooth-wall turbulent boundary layer" by Lim, H.D. & Vanderwel, C. (2023) in Journal of Fluid Mechanics.
This dataset contains data files supporting the figures in the manuscript in .mat format. This includes maps of the mean and turbulent properties of scalar dispersion in the boundary layer. Within the folder, a readme file is provided explaining the data fields and how to interpret them.
File names with P1, P2, P3, describe the location of the field-of-view.
File names with Cs1, Cs50, etc, describe the source concentration (mg/L).
See figure 1 and table 1 of the manuscript.
Files ending with _CfluxMEAN can be loaded into matlab as ACM struct. It contains the time-averaged (i.e. mean) PIV and PLIF data.
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Asphodel H.D.
No full textDESTROY, H.D. had pencilled across the title page of this autobiographical novel. Although the manuscript survived, it has remained unpublished since its completion in the 1920s. Regarded by many as one of the major poets of the modernist period, H.D. created in Asphodel a remarkable and readable experimental prose text, which in its manipulation of technique and voice can stand with the works of Joyce, Woolf, and Stein; in its frank exploration of lesbian desire, pregnancy and motherhood, artistic independence for women, and female experience during wartime, H.D.\u27s novel stands alone. A sequel to the author\u27s HERmione, Asphodel takes the reader into the bohemian drawing rooms of pre-World War I London and Paris, a milieu populated by such thinly disguised versions of Ezra Pound, Richard Aldington, May Sinclair, Brigit Patmore, and Margaret Cravens; on the other side of what H.D. calls the chasm, the novel documents the war\u27s devastating effect on the men and women who considered themselves guardians of beauty. Against this riven backdrop, Asphodel plays out the story of Hermione Gart, a young American newly arrived in Europe and testing for the first time the limits of her sexual and artistic identities. Following Hermione through the frustrations of a literary world dominated by men, the failures of an attempted lesbian relationship and a marriage riddled with infidelity, the birth of an illegitimate child, and, finally, happiness with a female companion, Asphodel describes with moving lyricism and striking candor the emergence of a young and gifted woman from her self-exile. Editor Robert Spoo\u27s introduction carefully places Asphodel in the context of H.D.\u27s life and work. In an appendix featuring capsule biographies of the real figures behind the novel\u27s fictional characters, Spoo provides keys to this roman à clef.https://digitalcommons.law.utulsa.edu/books/1017/thumbnail.jp
On the effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in indoor spaces
No full textThe effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in two scaled room models are investigated using simultaneous planar laser-induced fluorescence and particle-image velocimetry techniques. For a small 3 m high room, where the length-scales of the people and room are comparable, the walking motions significantly influenced the macro room mean flow patterns. This has a strong effect on the scalar dispersion properties as the magnitudes of the advective scalar fluxes are often comparable or larger than the turbulent scalar fluxes. As such, the scalar dispersion properties are case specific. For a large 9 m high room, the walking motion influenced only the local mean flow field. The increase in walking speed and crowd density improves the efficiency in which the scalar is transported and mixed with fresh ambient fluid out of the measurement plane (i.e. along the direction of the motion), leading to scalar-free zones observed on the opposite side of the room from the ventilation outlet. The area of the scalar-free zone increases with an increase in the walking speed and crowd density. The advective scalar fluxes are more sensitive to the human motion than the turbulent components, and as the mixing efficiency improves, the advective fluxes show a greater weakening with increased distance from source. The concentration PDFs in the near-source region can be described by the exponential function where the expected value at the 99% percentile can be derived as C
99/c
rms
′=4.61, which agreed well with the experimental measurements of 4.1 to 5.9.</p
Experimental investigation of scalar dispersion in indoor spaces
No full textThe scalar dispersion from point sources in indoor spaces is experimentally investigated using simultaneous particle–image velocimetry and planar laser-induced fluorescence techniques in a 20:1 and a 60:1 full-to-model scale room model. The ventilation inlets dominate turbulence production, with magnitudes of the velocities and Reynolds stresses observed to increase with air changes per hour (ACH). Mean concentration maps show a dependence on the ACH and source location which is attributed to the flow field at the near-source region. The peak-to-mean concentration shows a weak dependence on the mean concentration and concentration variance maps, indicating risk for toxic chemicals may be underpredicted if based only on these information. The concentration PDFs are generally well-described by exponential distributions with C
99/c
rms
′ values never exceeding 5.0. The magnitudes of the advective and turbulent scalar fluxes are strongly dependent on the ACH and source location, neither of which are able to dominate the other by more than an order of magnitude. The eddy diffusivity tensor was measured and a conditional-averaging based method is proposed to approximate it to an isotropic eddy diffusion coefficient, K. For real applications where K is used to estimate magnitudes of the turbulent scalar flux using the gradient transport model, the assumption of isotropic turbulence can introduce an uncertainty of around 17.8%.</p
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