Flow characteristics of jet fans in mines: experimental and numerical modeling

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dc.contributor.authorKonduri, Indu Mohanen
dc.contributor.committeechairMcPherson, Malcolm J.en
dc.contributor.committeememberTopuz, Ertugrulen
dc.contributor.committeememberKarfakis, Mario G.en
dc.contributor.committeememberHajj, Muhammad R.en
dc.contributor.committeememberGoodman, Gerrit V. R.en
dc.contributor.departmentMining and Minerals Engineeringen
dc.date.accessioned2014-03-14T21:12:19Zen
dc.date.adate2008-06-06en
dc.date.available2014-03-14T21:12:19Zen
dc.date.issued1996-12-05en
dc.date.rdate2008-06-06en
dc.date.sdate2008-06-06en
dc.description.abstractThe use of induction fans for face ventilation in room and pillar mines has proved to be an efficient, flexible, and viable technique. In addition to their merits over conventional systems, induction fans enable remote controlled mine operations with low maintenance requirements. Theoretical investigations were conducted initially to verify the potential of free air jets in mine ventilation. A laboratory model using water as the fluid medium was designed to study the flow characteristics of a jet fan in a blind entry. The model was tested in a variety of brattice curtain and nozzle combinations to investigate the ventilating efficiency of jet fans. A jet fan was selected and tested in a full scale model and in a coal mine. Experiments were conducted to evaluate the laboratory flow models. Flow quantities and velocities in the entry were measured using state-of-the-art instrumentation to quantify various parameters. Air velocities near the face were found to be satisfactory to dilute contaminants from the face. A model for the axial velocity profile of the jet was suggested. Beyond 25m distance from the jet fan exit the jet tended to move away from the wall to the opposite wall. Carbon dioxide was used as a tracer gas to measure the effective ventilating air quantity near the face and re-circulation in various tests. The re-circulation involved in the system was found to be less than 40% in all the experiments. It was also found that the use of line curtains in combination with a jet a fan can eliminate any type of re-circulation. Numerical modeling of a jet fan in a typical coal mine heading was conducted to obtain details of the flow. The results of the simulation using computational fluid dynamics were similar to the flow patterns observed in the experiments. It was found that a jet fan can effectively ventilate an entry as deep as 40m. Fan positioning, airway geometry, airway surface properties, and mine layout severely affect its performance. It is therefore necessary to understand the flow mechanics of a jet fan in a mine heading before applying the technique for a particular situation.en
dc.description.degreePh. D.en
dc.format.extentxiii, 163 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06062008-152159en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06062008-152159/en
dc.identifier.urihttp://hdl.handle.net/10919/38058en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1996.K663.pdfen
dc.relation.isformatofOCLC# 36860562en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectconfined jetsen
dc.subjectfluid jetsen
dc.subjectventilationen
dc.subjectModelingen
dc.subjectjet fan designen
dc.subject.lccLD5655.V856 1996.K663en
dc.titleFlow characteristics of jet fans in mines: experimental and numerical modelingen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMining and Minerals Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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