Effect of swirl blade on flow pattern in nozzle for uphill teeming
2006 (English)In: Sohn International Symposium Advanced Processing of Metals and Materials, Vol 2: Thermo And Physicochemical Principles: Iron And Steel Making / [ed] Kongoli, F; Reddy, RG, 2006, 471-484 p.Conference paper (Refereed)
The fluid flow in the mold during up-hill teeming is of great importance for the quality of the cast ingot and therefore the quality of the final steel products. At the early stage of the filling of an up-hill teeming mold, steel enters, with high velocity, through the nozzle into the mold and the turbulence on the meniscus could lead to entrainment of mold flux. The entrained mold flux might subsequently end up as defects in the final product. It is therefore very important to get a mild and stable inlet flow in the entrance region of the mold. It has been acknowledged recently that swirling motion induced using a twist tape swirl blade, in the submerged entry nozzle is remarkably effective to control the fluid flow pattern in both the slab and billet type continuous casting molds, resulting in increased productivity and quality of the produced steel. From the above result, we propose, swirling flow generated through a swirl blade inserted into the entry nozzle, as a new method of reducing the deformation of the rising surface and the unevenness of the flow during filling of the up-hill teeming mold. The swirling blade has two features: (1) to generate a swirling flow in the entrance nozzle and (2) to suppress the uneven flow, generated/developed after flowing through the elbow. The effect of the use of a twist tape swirl blade was studied using both numerical calculations and physical modeling. Water modeling was used to assert the effect of the swirling blade on rectifying of tangential and axial velocities in the filling tube for the up-hill teeming and also to verify the results from the numerical calculations.
Place, publisher, year, edition, pages
2006. 471-484 p.
swirling flow, up-hill teeming, nozzle, casting, fluid flow, modeling, CFD, LDA
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-41765ISI: 000241805400042ScopusID: 2-s2.0-33846064321ISBN: 0-87339-635-9OAI: oai:DiVA.org:kth-41765DiVA: diva2:444919
Sohn International Symposium on Advanced Processing of Metals and Materials Location: San Diego, CA Date: AUG 27-31, 2006
QC 201109302011-09-302011-09-302011-09-30Bibliographically approved