Journal ArticleDOI
An experimental study of viscous flows in contractions
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In this paper, the authors investigated the flow processes involved in single-phase viscous flows in nozzles and orifice plates and found that they are geometrically similar and have similar resistance to flow.Abstract:
The need to improve the methods used when designing emergency, pressure-relief systems on polymerisation reactors, has made the flow of highly viscous fluids in pipeline fittings highly topical. This paper investigates the flow processes involved in single-phase, viscous flows in nozzles and orifice plates. These fittings were chosen because they would give an insight into the behaviour of highly viscous flows in other geometries, such as the flow upstream of the seat in a pressure relief valve. Experimental data are presented for a pipe, two conical nozzles and a sharp-edged orifice plate for laminar flows in the Reynolds number range 50–400 and for turbulent flows. The volume flow rate—pressure drop characteristics are presented for both nozzles and the orifice plate. The discharge momentum flow rate for the pipe, a nozzle and the orifice plate are also given. Analysis of the data shows that nozzles and orifice plates that are geometrically similar have a similar resistance to flow. It is also shown that the contraction coefficient for an orifice plate tends to unity at low Reynolds numbers.read more
Citations
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Journal ArticleDOI
External gear pumps operating with non-Newtonian fluids: Modelling and experimental validation
Fnu Rituraj,Andrea Vacca +1 more
TL;DR: The technique of modelling external gear pumps that operate with non-Newtonian fluids is described, in particular, how the displacing action of the unit can be modelled using a lumped parameter approach which involves dividing fluid domain into several control volumes and internal flow connections.
Journal ArticleDOI
Vertically upward two-phase flow with a highly viscous liquid-phase in a nozzle and orifice plate
TL;DR: Water and glycerine were used to produce solutions with nominal liquid viscosities of 1, 100, 250 and 550 mPa for subsonic and sonic discharges in this article.
Journal ArticleDOI
The innovative design of air caps for improving the thermal efficiency of CFB boilers.
TL;DR: In this paper, a small-scale test bench of a 220 t/h CFB boiler was developed, integrated with novel air caps, and it has been observed that inhomogeneity in air flow velocity decreases from 65.79% to 21.25% while the pressure drop decreases by 20%.
Journal ArticleDOI
Modelling the flow of Non-Newtonian fluids through sharp orifices
Fnu Rituraj,Andrea Vacca +1 more
References
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Book
Mechanics of Fluids
TL;DR: In this article, the authors present fundamental concepts and principles governing fluids in motion problems, including the Momentum Equation (ME) and the Laminar Flow between Solid Boundaries (LFL) problems.
Journal Article
Head losses in pipe fittings at low Reynolds numbers
TL;DR: In this article, a certain nombre de fluides newtonien and non-newtonien s'ecoulent a travers des coudes, des soupapes, des etranglements, des expansions, and des plaques perforees.
Journal ArticleDOI
Loss Characteristics of Orifices and Nozzles
Journal ArticleDOI
A mechanistic approach to laminar flow through an abrupt enlargement
TL;DR: In this article, a semi-empirical, mechanistic approach was used to develop a simple, one-dimensional flow model that allowed these energy loss mechanisms to be understood.
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