465 research outputs found
Mass transfer and hydrodynamic characteristics of new carbon carbon packing: Application to CO2 post-combustion capture
A novel structured packing, the 4D packing, has been characterized in terms of hydrodynamics, effective area and gas side mass transfer coefficient. The increase of the 4D opening fraction allows to reduce pressure drop and to get a better capacity than Mellapak 500Y and 750Y, for which the geometric areas are similar. The 50% open 4D packing, 4D-50%, leads to effective areas which are higher than Mellapak 500Y ones, and doubled compared with Mellapak Plus 252Y ones. Effective areas for the 4D do not decrease when the opening fraction increases from 30 to 50%, this indicates that a non-negligible amount of droplets is generated at 50%. Gas side mass transfer coefficient had been measured with an original experimental method: water evaporation. Corresponding results seem to be in agreement with the literature, and with the fact that a large amount of droplets is generated. Correlations are proposed for both effective area and gas side mass transfer coefficient for the 4D-50%.The 4D-50% packing could be very interesting for post-combustion CO2 capture since it generates low pressure drop and a very high interfacial area. This will be further confirmed by an economic study for which the absorber plant will be designed with a rate based model
Performance characteristics of a new structured packing
A new structured packing using carbon fibres, called SepcarbÂź 4D, is presented. This packing has several attractive properties, such as high voidage (Δ=94%) and high effective area (a=420 m2 mâ3). These properties are advantageous for packing used as a gasâliquid contactor for separation units. To determine the internal characteristics of this packing, we performed several experiments using a 150-mm-internal-diameter column. Firstly, hydrodynamics experiments were conducted using an airâwater counter current flow to determine the pressure drop (for both dry and wet packing) and flooding point. Secondly, the mass transfer efficiency was determined in terms of HETP (height equivalent to theoretical plate) by total reflux experiments with an n-heptane/cyclohexane mixture at atmospheric pressure. Hydrodynamic performance and mass transfer efficiency were compared with those of packings generally used in distillation and absorption
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A new method of probing mechanical losses of coatings at cryogenic temperatures
A new method of probing mechanical losses and comparing the corresponding
deposition processes of metallic and dielectric coatings in 1-100 MHz frequency
range and cryogenic temperatures is presented. The method is based on the use
of extremely high-quality quartz acoustic cavities whose internal losses are
orders of magnitude lower than any available coatings nowadays. The approach is
demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica
coatings. The coating has been found to
exhibit a loss angle lower than near 30 {\rm MHz} at 4 {\rm
K}. The results are compared to the previous measurements
Critical Review: On Catherine Wilson'S Epicureanism at the Origins of Modernity
on C Wilson, Epicureanis
The material soul: Strategies for naturalising the soul in an early modern epicurean context
We usually portray the early modern period as one characterised by the âbirth of subjectivityâ with Luther and Descartes as two alternate representatives of this radical break with the past, each ushering in the new era in which âIâ am the locus of judgements about the world. A sub-narrative called âthe mind-body problemâ recounts how Cartesian dualism, responding to the new promise of a mechanistic science of nature, âsplit offâ the world of the soul/mind/self from the world of extended, physical substanceâa split which has preoccupied the philosophy of mind up until the present day. We would like to call attention to a different constellation of textsâneither a robust âtraditionâ nor an isolated âepisodeâ, somewhere in betweenâwhich have in common their indebtedness to, and promotion of an embodied, Epicurean approach to the soul. These texts follow the evocative hint given in Lucretiusâ De rerum natura that âthe soul is to the body as scent is to incenseâ (in an anonymous early modern French version). They neither assert the autonomy of the soul, nor the dualism of body and soul, nor again a sheer physicalism in which âintentionalâ properties are reduced to the basic properties of matter. Rather, to borrow the title of one of these treatises (LâĂme MatĂ©rielle), they seek to articulate the concept of a material soul. We reconstruct the intellectual development of a corporeal, mortal and ultimately material soul, in between medicine, natural philosophy and metaphysics, including discussions of Malebranche and Willis, but focusing primarily on texts including the 1675 Discours anatomiques by the Epicurean physician Guillaume Lamy; the anonymous manuscript from circa 1725 entitled LâĂme MatĂ©rielle, which is essentially a compendium of texts from the later seventeenth century (Malebranche, Bayle) along with excerpts from Lucretius; and materialist writings such Julien Offray de La Mettrieâs LâHomme-Machine (1748), in order to articulate this concept of a âmaterial soulâ with its implications for notions of embodiment, materialism and selfhood
Como era ardiloso o meu francĂȘs: Charles-Marie de la Condamine e a AmazĂŽnia das Luzes
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