Improved prediction of shell side heat transfer in horizontal evaporative shell and tube heat exchangers

This paper presents an improved prediction method for the heat transfer and pressure drop in the shell side of a horizontal shell and tube evaporator. The results from an experimental test program are used in which a wide range of evaporating two-phase shell side flow data was collected from a TEMA E-shell evaporator. The data are compared with shell side heat transfer coefficient and pressure drop models for homogeneous and stratified flow. The comparison suggests a deterioration in the heat transfer data at low mass fluxes consistent with a transition from homogeneous to stratified flow. The pressure drop data suggest a stratified flow across the full test range. A new model is presented that suggests the transition in the heat transfer data may be due to the extent of tube wetting in the upper tube bundle. The new model, which also takes into account the orientation of the shell side baffles, provides a vast improvement on the predictions of a homogenous type model. The new model would enable designers of shell side evaporators/reboilers to avoid operating conditions where poor heat transfer could be expected, and it would also enable changes in process conditions to be assessed for their implications on likely heat transfer performance. (Abstract from WOK

Vortex nucleation in bose-einstein condensates due to effective magnetic fields

We investigate the rotational properties of a Bose-Einstein condensate (BEC) in an effective magnetic field. The corresponding gauge potential is optically generated, and based on the adiabatic motion of the atoms. We demonstrate that the nucleation of vortices is seeded by instabilities in surface excitations and show that this picture also holds when the applied effective magnetic field is not homogeneous. The eventual configuration of vortices in the cloud depends on the geometry of the applied field

Gartcosh Steel Mill regeneration project

New hi-tech, innovative businesses are springing up where Scotland's heavy industries once reigned supreme. Redevelopment of the former Ravenscraig steel works in Lanarkshire is continuing apace with a new town centre, complete with commercial facilities, soon to be constructed. The site of the former Gartcosh Steel Mill, also in Lanarkshire, is also being transformed, and architects and engineers from the University of Strathclyde are driving forward the plans. Gartcosh Business Interchange is set to become a new 50-hectare business location which has already been selected as the location for the major new office campus for Scotland's new FBI-style crime unit.It is anticipated that Gartcosh will create up to 170,000 sq ft of business space which could support up to 4000 jobs

Nonlinear electromagnetic wave equations for superdense magnetized plasmas

By using the quantum hydrodynamic and Maxwell equations, we derive the generalized nonlinear electron magnetohydrodynamic, the generalized nonlinear Hall-MHD (HMHD), and the generalized nonlinear dust HMHD equations in a self-gravitating dense magnetoplasma. Our nonlinear equations include the self-gravitating, the electromagnetic, the quantum statistical electron pressure, as well as the quantum electron tunneling and electron spin forces. They are useful for investigating a number of wave phenomena including linear and nonlinear electromagnetic waves, as well as three-dimensional electromagnetic wave turbulence spectra and structures arising from mode coupling processes at nanoscales in dense quantum magnetoplasmas

Measuring the volume and value of the outputs of higher education institutions

One of the key issues facing the Scottish Government and Scottish Funding Council is how to assess the contribution made to Scotland's economy by Scotland's higher education sector. Higher Education's contribution to the economy and society at large is viewed as providing one of the most important justifications for government expenditure on higher education. However there is a paucity of robust quantitative evidence against which related resource allocation decisions aimed at encouraging economically valuable activity can be made. Taking higher education activity as a whole there has been no practical, valid, way to analyse the economic value of what universities do, or to compare the value thus created with that generated by other activities in the economy. The overall objective of this paper is to show how the development of a framework with comprehensive and detailed quantitative measures of the outputs of HEIs in both volume and value terms can enable a holistic analysis of higher education institutions' economic value. The present paper draws on initial case study research supported by the Nuffield Foundation which was further elaborated in two substantive reports to the Scottish Funding Council

Almost sure and moment exponential stability of Euler-Maruyama discretizations for hybrid stochastic differential equations

Positive results are derived concerning the long time dynamics of numerical simulations of stochastic differential equation systems with Markovian switching. Euler-Maruyama discretizations are shown to capture almost sure and momente xponential stability for all sufficiently small timesteps under appropriate conditions

Valuing knowledge transfer : a new approach to assessing the broader impact of higher education institutions

There is considerable policy interest in exploring the overall value of higher education to society and in how higher education can support wider economic growth and development through 'knowledge transfer' from higher education institutions. Until fairly recently consideration of 'knowledge transfer' activity has tended to be mainly focussed on those HEI outputs that are commercial or market-based, relate to interaction with businesses and which are also relatively easy to measure (licensing, patents, consultancy contracts and so on). However it is beginning to be recognised that non-market outputs of higher education institutions (such as community interactions) could also have significant economic and social value linked to their support of knowledge flow to the wider community. This paper presents a new perspective on knowledge transfer from institutions. It demonstrates the application of welfare economic principles to estimate the value of non-market outputs of higher education institutions and It presents the results of a pilot study of 3 areas of non-market activity of Scottish higher education institutions, namely community engagement, cultural outreach and public policy advisory activity

Synthesis of indoles via alkylidenation of acyl hydrazides

Indoles have been synthesised via alkylidenation of acyl phenylhydrazides using phosphoranes and the Petasis reagent, followed by in situ thermal rearrangement of the product enehydrazines. The Petasis reagent provides an essentially neutral equivalent of the [acid-catalysed] Fischer indole synthesis, but with acyl phenylhydrazides as starting substrates. Alkylidene triphenylphosphoranes convert aroyl phenylhydrazides to indoles, but acyl phenylhydrazides derived from aliphatic carboxylic acids undergo a Brunner reaction to form indolin-2-ones

Categorisation of designs according to preference values for shape rules

Shape grammars have been used to explore design spaces through design generation according to sets of shape rules with a recursive process. Although design space exploration is a persistent issue in computational design research, there have been few studies regarding the provision of more preferable and refined outcomes to designers. This paper presents an approach for the categorisation of design outcomes from shape grammar systems to support individual preferences via two customised viewpoints: (i) absolute preference values of shape rules and (ii) relative preference values of shape rules with shape rule classification levels with illustrative examples