|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|145625||456345||2016||6 صفحه PDF||سفارش دهید||دانلود رایگان|
• Measured rheological behaviors of dewatered sludge are device-dependent.
• A shear localization appears during rheological measurements.
• Usual rheological models no longer works with dewatered sludge.
• Pipe flow of dewatered sludge has to be modeled considering a slipping behavior.
The current design of dewatered sludge pumping devices is based on material flowing properties assuming it is a non-Newtonian highly viscous fluid. From rheological analysis, we first clearly established that current rheological models are no longer valid for this purpose. By using parallel-plates geometry, it was shown that the apparent behavior is dependent on the gap between the plates: results are less representative of sludge intrinsic properties that of the interface interactions between sludge and rotating surfaces. By reproducing dewatered sludge pipe flow at lab-scale, it was highlighted that sludge does not flow but slips along the wall of the pipe. The existence of a thin lubrication layer is suspected and the behavior law to be considered is a slippery law, similar to a Norton–Hoff model.
Journal: Chemical Engineering Journal - Volume 295, 1 July 2016, Pages 494–499