TU Delft - CFD in drinking water treatment

TU Delft - CFD in drinking water treatment

CFD in drinking water treatment
According to the new Water Supply Act, the removal of micro-organisms in the purification of water must meet very stringent requirements. This means that the hydraulic flow of the water in purification systems such as ozonisation and UV-desinfection must also comply with very stringent requirements, since short-circuit flows must in no way occur as they strongly reduce the efficiency. The efficiency of peripheral facilities of sewer systems, at overflow locations, also strongly depend on the flow through the peripheral facility. The efficiency of peripheral facilities of sewer systems, at overflow locations, also strongly depend on the flow through the peripheral facility.In view of the large variation in hydraulic design of peripheral facilities, rationalisation seems to be called for. Finally, the number of breakdowns of sewage pumping-stations, an important cause of overflow, can be reduced by improving the hydraulic design of the pump pit, such that sediment can no longer accumulate at the inlet. So, these research projects focus on describing the flow in treatment plants, pump pits and peripheral facilities by means of CFD modelling.
Amsterdam Water Supply AWS of the Netherlands produces some of the cleanest drinking water in the world, almost 100 million cubic meters per year in fact. They take the water from the Rhine River and purify it in a 14-step process. During the ozone treatment, ozone gas reacts with particular micropollutants in a turbulent tank and inactivates pathogenic micro-organisms. In the perfect world, the water and the ozone gas mix and stay in the reactor just long enough to knock out the targeted pollutants. Dr. Jan Hofman of the AWS Research Planning and Development Department and his colleagues Dolf Wind and Rodolphe Janssens use FEMLAB with scattered flow meter data and tracer experiments to look inside and create the perfect world...more

Welcome to IEEE Xplore 2.0: A simplified CFD model for the radial blower

Welcome to IEEE Xplore 2.0: A simplified CFD model for the radial blower


A simplified CFD model for the radial blowerRoknaldin, F. Sahan, R.A. Sun, X.H. Appl. Thermal Technol. Inc., Santa Clara, CA, USA;
This paper appears in: Thermal and Thermomechanical Phenomena in Electronic Systems, 2002. ITHERM 2002. The Eighth Intersociety Conference onPublication Date: 2002On page(s): 600- 604ISSN: 1089-9870 ISBN: 0-7803-7152-6INSPEC Accession Number: 7425613Digital Object Identifier: 10.1109/ITHERM.2002.1012509Posted online: 2002-08-07 00:45:27.0
AbstractDetailed level Computational Fluid Dynamics (CFD) models for fans and radial blowers involve information about blade geometry, flow angles, blade rotational speed, and flow approach velocities. Accurate simulations of such models require large numbers of mesh points which is beyond the allocated time and available resources for engineering design cycles. When dealing with system or board level thermal analysis, where a fan or a blower is among many components to be modeled, a "macro" representation of a fan or a blower is preferred. A "macro" model for a fan is a plane surface that induces pressure across as the flow passes through it. The pressure-airflow relationship is taken from the fan curve provided by the fan manufacturer. A "macro" model for a radial blower is more involved because of the 90/spl deg/ flow turn inside the blowers housing and induced flow swirl caused by impeller blades. The need to capture the flow turn and induced swirl becomes more pronounced when simulating multiple interacting blowers inside a blower tray. In this paper, a systematic approach is presented to design the blower macro from the existing fan model. Icepak CFD results for the blower tray have been analyzed and compared with the experiments conducted at Applied Thermal Technologies Laboratory. Typical use of a three-fan blower tray in a system representing telecommunication applications is also presented.