- Author
- Bobert, M.
- Title
- Skumvatskor-Koppling mellan viskositetsdata och rorstromning. [Foam Concentrates: Correlation Between Viscosity Properties and Pipeflow.]
- Coporate
- Swedish National Testing and Research Inst., Boras, Sweden
- Report
- SP REPORT 1995:10, 1995, 57 p.
- Keywords
- viscosoty | pipes | flow rate | tests
- Identifiers
- foam concentrates; non-newtonien; power-law; herschel-bulkley; rheology; pipe flow
- Abstract
- [ONLY ABSTRACT IN ENGLISH] The main task with this project has been to establish a method that describes the flow characteristics of foam concentrates. The foam concentrates that are used today do not always have a constant viscosity but is rather dependent upon flow rate and the dimension of the suction hose, etc., i.e. they are non-newtonian. The project has been focused on pipe flow rate since the topic in question is applicable for most proportioning equipment's. Tests with orifices have also been made in order to establish a comprehensive view. The tests show that it is possible to determine so called rheological constants that describe pressure drops and the flow rate of the pipe flow. The test results have been adapted to fit an imperical model called the Herschel-Bulkley model in order to define the fluids. The rheological constants, which are determined through small scale pipe flow tests, and the flow coefficients established through tests with orifices, are later used in order to describe different cases of dimensioning of suction hoses for e.g. inductors. The results show that the method presently used in different standards for foam concentrates to decide the characteristics of the fluids are insufficient since they do not provide a basis for estimating the rheological constants that together with the model describes the relation between viscosity properties and pipeflow. The tests with orifices showed that test results with non-Newtonian fluids differs from test results made with Newtonian fluids, especially through a higher flow coefficient. Further research work is suggested to study the use of Cone and Plate viscosimeter to provide the rheological constants and to study the flow properties in orifices and other components such as pipe elbows, T-connections and reducers.