43 research outputs found
Maps, Memories and Manchester: The Cartographic Imagination of the Hidden Networks of the Hydraulic City
The largely unseen channelling, culverting and controlling of water into, through and out of cities is the focus of our cartographic interpretation. This paper draws on empirical material depicting hydraulic infrastructure underlying the growth of Manchester in mapped form. Focusing, in particular, on the 19th century burst of large-scale hydraulic engineering, which supplied vastly increased amounts of clean drinking water, controlled unruly rivers to eliminate flooding, and safely removed sewage, this paper explores the contribution of mapping to the making of a more sanitary city, and towards bold civic minded urban intervention. These extensive infrastructures planned and engineered during Victorian and Edwardian Manchester are now taken-for-granted but remain essential for urban life. The maps, plans and diagrams of hydraulic Manchester fixed particular forms of elite knowledge (around planning foresight, topographical precision, civil engineering and sanitary science) but also facilitated and freed flows of water throughout the city. The survival of these maps and plans in libraries, technical books and obscure reports allows the changing cultural work of water to be explored and evokes a range of socially specific memories of a hidden city. Our aetiology of hydraulic cartographics is conducted using ideas from science and technology studies, semiology, and critical cartography with the goal of revealing how they work as virtual witnesses to an 1 unseen city, dramatizing engineering prowess and envisioning complex and messy materiality into a logical, holistic and fluid network underpinning the urban machine. 1
Hyperbolic contraction measuring systems for extensional flow
In this paper an experimental method for extensional measurements on medium viscosity fluids in contraction flow is evaluated through numerical simulations and experimental measurements. This measuring technique measures the pressure drop over a hyperbolic contraction, caused by fluid extension and fluid shear, where the extensional component is assumed to dominate. The present evaluative work advances our previous studies on this experimental method by introducing several contraction ratios and addressing different constitutive models of varying shear and extensional response. The constitutive models included are those of the constant viscosity Oldroyd-B and FENE-CR models, and the shear-thinning LPTT model. Examining the results, the impact of shear and first normal stress difference on the measured pressure drop are studied through numerical pressure drop predictions. In addition, stream function patterns are investigated to detect vortex development and influence of contraction ratio. The numerical predictions are further related to experimental measurements for the flow through a 15:1 contraction ratio with three different test fluids. The measured pressure drops are observed to exhibit the same trends as predicted in the numerical simulations, offering close correlation and tight predictive windows for experimental data capture. This result has demonstrated that the hyperbolic contraction flow is well able to detect such elastic fluid properties and that this is matched by numerical predictions in evaluation of their flow response. The hyperbolical contraction flow technique is commended for its distinct benefits: it is straightforward and simple to perform, the Hencky strain can be set by changing contraction ratio, non-homogeneous fluids can be tested, and one can directly determine the degree of elastic fluid behaviour. Based on matching of viscometric extensional viscosity response for FENE-CR and LPTT models, a decline is predicted in pressure drop for the shear-thinning LPTT model. This would indicate a modest impact of shear in the flow since such a pressure drop decline is relatively small. It is particularly noteworthy that the increase in pressure drop gathered from the experimental measurements is relatively high despite the low Deborah number range explored
Learning from Blackpool Promenade: Re-enchanting sterile streets
In this article, the authors contend that contemporary urban streets are over-regulated, preoccupied with surveillance, commercial requirements and rapid transit, aesthetically homogeneous and sensually sterile. As an exemplary site of contrast, the article focuses on the recently redesigned Blackpool Promenade. First, it argues that this redesign honours the resort’s popular traditions, its potent heritage and the importance of innovation. Second, it explores how the promenade fosters playful interactions, conviviality and lingering. Third, the article focuses on sensory attributes that enhance the experience of promenaders
Effect of size reduction on colour, hydration and rheological properties of wheat bran
Sunken Cities: Climate Change, Urban Futures and the Imagination of Submergence
Climate change presents multiple challenges to cities—not only in terms of the resilience and sustainability of the urban fabric, but also in relation to how urban inhabitants imagine they might adapt to a future transformed environment. This article explores imaginative modes of thinking in relation to future cities and climate change, focusing on representations of urban drowning or submergence. It considers, in turn, climate‐change fictions—from J.G. Ballard's 1962 novel The Drowned World to Paulo Bacigalupi's The Drowned Cities, published in 2012; visual representations from Gustave Doré's The New Zealander in 1872 to Alexis Rockman's 2004 Manifest Destiny; and architectural conjecture, from Wolf Hilbertz's Autopia Ampere project from 1970 onwards to CRAB Studio's Soak City in 2009. The article draws out how these imaginaries intersect with theoretical understandings of science fiction and ecology, contending that an emphasis on multiple imaginaries of climate change is critical to expanding the narrow range of possibilities that currently characterize the literature on cities and climate change. Imaginative texts, images and designs mutually inform each other to encourage holistic ways of approaching how we think about the prospect of urban submergence and to incubate radical responses to it
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Comparison of predictions of baking volume using large deformation rheological properties
Three large deformation rheological tests, the Kieffer dough extensibility system, the D/R dough inflation system and the 2 g mixograph test, were carried out on doughs made from a large number of winter wheat lines and cultivars grown in Poland. These lines and cultivars represented a broad spread in baking performance in order to assess their suitability as predictors of baking volume. The parameters most closely associated with baking volume were strain hardening index, bubble failure strain, and mixograph bandwidth at 10min. Simple correlations with baking volume indicate that bubble failure strain and strain hardening index give the highest correlations, whilst the use of best subsets regression, which selects the best combination of parameters, gave increased correlations with R-2 = 0.865 for dough inflation parameters, R-2 = 0. 842 for Kieffer parameters and R-2 = 0.760 for mixograph parameters. (c) 2007 Elsevier Ltd. All rights reserved