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2004

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Articles 211 - 216 of 216

Full-Text Articles in Chemical Engineering

Environmentally-Friendly Physico-Chemical Rapid Ultrasonic Recycling Of Fumed Silica-Filled Poly(Dimethyl Siloxane) Vulcanizate, Sang Eun Shim, Victor V. Yashin, Avraam I. Isayev Dec 2003

Environmentally-Friendly Physico-Chemical Rapid Ultrasonic Recycling Of Fumed Silica-Filled Poly(Dimethyl Siloxane) Vulcanizate, Sang Eun Shim, Victor V. Yashin, Avraam I. Isayev

Avraam I Isayev

Fumed silica-filled PDMS, where quite a strong interaction exists between the filler and matrix via hydrogen bonding, was recycled by means of an extruder with high power ultrasound attachment. It was found that the reinforcing filler plays an important role in the devulcanization process. Compared to the precipitated silica-filled PDMS, higher power is consumed during the devulcanization process of fumed silica-filled PDMS due to a strong interaction between the fumed silica particles and PDMS chains. The decrease in crosslink density after the devulcanization process shows that the process is quite dependent on the concentration of fumed silica. Throughout a simulation …

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Workbook Strategy In Engineering Education, Yasar Demirel Dec 2003

Workbook Strategy In Engineering Education, Yasar Demirel

YASAR DEMIREL

Mismatches between the learning and teaching styles are common because students are in majority visual and sensing learners, yet most instructors are intuitive and reflective learners. Beside that, textbooks also have their own styles, and their contents, depth of coverage of materials, and organization may affect the teaching and learning. For reducing the mismatches, and achieving effective teaching and active learning, we present ‘workbook strategy,” which integrates the following four elements: (i) classroom analysis, (ii) use of workbook beside textbook, (iii) group work, and (iv) use of ‘blackboard’ as information technology. The workbook strategy provides all the essential verbal and …

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Exergy Use In Bioenergetics, Yasar Demirel Dec 2003

Exergy Use In Bioenergetics, Yasar Demirel

YASAR DEMIREL

The energy management in a living cell is studied.

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Exergy-Based Performance Analysis Of Packed-Bed Solar Air Heaters, Yasar Demirel, H.H. Ozturk Dec 2003

Exergy-Based Performance Analysis Of Packed-Bed Solar Air Heaters, Yasar Demirel, H.H. Ozturk

YASAR DEMIREL

This paper presents an experimental investigation of the thermal performance of a solar air heater having its flow channel packed with Raschig rings. The packing improves the heat transfer from the plate to the air flow underneath. The dimensions of the heater are 0.9m wide and 1.9m long. The aluminium-based absorber plate was coated with ordinary black paint. The characteristic diameter of the Raschig rings, made of black polyvinyl chloride (PVC) tube, is 50mm and the depth of the packed-bed in flow channel is 60 mm. Energy and exergy analyses were applied for evaluating the efficiency of the packed-bed solar …

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Burning Sewage Sludge From A Municipal Waste Water Treatment Plant – The Migreation Of Metals, Witold Zukowski, Jerzy Baron, Sylwia Chrupek, Malgorzata Pilawska Dec 2003

Burning Sewage Sludge From A Municipal Waste Water Treatment Plant – The Migreation Of Metals, Witold Zukowski, Jerzy Baron, Sylwia Chrupek, Malgorzata Pilawska

Witold Zukowski

The migration of selected heavy metals has been analysed when sewage sludge from a municipal waste water treatment plant was burned in a bubbling fluidised bed. It has been shown that manganese, lead, arsenic, mercury and cadmium, as opposed to chromium, nickel and copper, leave the reactor mainly via the gas phase. To reduce the emissions of heavy metals to the atmosphere associated with the thermal utilization of sewage sludge requires more effective flue gases cleaning than is possible with filters.

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Utilisation Of Waste Fuels In A Fluidised Bed, Jerzy Baron, Malgorzata Pilawska, Malgorzata Olek, Witold Zukowski Dec 2003

Utilisation Of Waste Fuels In A Fluidised Bed, Jerzy Baron, Malgorzata Pilawska, Malgorzata Olek, Witold Zukowski

Witold Zukowski

A 100 kW atmospheric, bubbling fluidised bed reactor was used to study the combustion of wood waste, sewage sludge and a mixture of sewage sludge and meat-and-bone meal. Steady operation of the combustor was possible, even if the fuel was abruptly changed. With sewage sludge, the flue gas concentrations of SO2 and NOx were relatively high, as the sludge fuel contained much higher concentrations of combined S and N than e.g. wood waste. Co-combustion of sewage sludge and meat-and-bone meal presented no problems and the composition of the flue gases was similar to obtained the combustion of sewage sludge from …

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