Papers by Vladan Prodanovic
Proceedings of the World Congress on Momentum, Heat and Mass Transfer, Apr 1, 2024
ISIJ International
Accelerated cooling (ACC) is one of the key processing steps in the production of Advanced High P... more Accelerated cooling (ACC) is one of the key processing steps in the production of Advanced High Performance Steels. In order to obtain thermo-mechanically controlled processed (TMCP) steel products with desired microstructures and mechanical properties, it is necessary to properly adjust the processing parameters of the cooling facility, and therefore it is critically important to quantify the physical process of heat removal by applying water jets on the hot surface of steel. In the present study we propose a mechanistic model for top jet cooling of a moving plate with circular and planar nozzles. The simulation model has been developed based on the extensive experimental database generated with pilot scale runout table tests, and it provides a potentially powerful tool for simulation of cooling of steel strips and plates over the entire length of the cooling facility. KEY WORDS: steel; jet impingement boiling; transient heat transfer; temperature modeling; accelerated cooling; runout table.
Heat transfer during run-out table cooling-effect of jet configuration
Industrial runout table cooling was simulated using an experimental pilot-scale facility. Using t... more Industrial runout table cooling was simulated using an experimental pilot-scale facility. Using this facility, experiments have been conducted to investigate the effect of bottom jet inclination angle and top jet nozzle configuration on the heat extraction during cooling of moving samples.
Proceedings of the Canadian Engineering Education Association, 2017
A new professional degree, Master of Engineering Leadership (MEL) has been introduced at the Univ... more A new professional degree, Master of Engineering Leadership (MEL) has been introduced at the University of British Columbia. This collaborative effort between the Faculty of Applied Science and Sauder School of Business provides an innovative, integrated curriculum tailored to accelerate experienced engineers and early career professionals toward effective, sectorrelevant leadership roles. This integrated curriculum includes a rigorous engineering content as well as project management, communication and business development modules.One area of specialisation, the MEL in Clean Energy Engineering (CEEN), provides advanced training across the energy industry value-chain: from sustainable energy generation and conversion technologies, to distribution,storage and management, smart distribution networks and energy policy. The program places students in an active learner’s position and challenges them to critical thinking about topics related to energy conservation andefficiency, energy an...
International Journal of Multiphase Flow, 2002
This study presents experimental data for subcooled¯ow boiling of water at pressures from 1.05 to... more This study presents experimental data for subcooled¯ow boiling of water at pressures from 1.05 to 3 bar, bulk liquid velocities ranging from 0.08 to 0.8 m/s, and subcooling from 10 to 30 K. Experiments were carried out on a vertical, annular test section with inner heating surface and upward water¯ow. High-speed photography at rates of 6000±8000 frames/s captured bubble behavior from inception to collapse, bubble shapes during lifetime, detachment from the wall and typical bubble size. Bubble growth and condensation rates, and variation of bubble lifetime and size with¯ow rate, subcooling, heat¯ux and pressure were, further, examined and new correlations proposed.
Effect of Inclination Angle and Flow Rate on the Heat Transfer During Bottom Jet Cooling of a Steel Plate
Journal of Heat Transfer, 2012
The heat transfer that occurs during bottom water jet impingement on a hot steel plate has been i... more The heat transfer that occurs during bottom water jet impingement on a hot steel plate has been investigated in terms of the effect inclination angle and flow rate. This research was carried out to develop quantitative knowledge of the heat transfer, which occurs on the runout table, a crucial component in the hot rolling production of advanced high strength steels. Industrially produced hot-rolled steel samples were instrumented with numerous subsurface thermocouples installed close to the quench surface. The experimental measurements were used in conjunction with an inverse heat conduction (IHC) model to quantify boiling characteristics as well as heat extraction histories for the different nozzle inclination angles and flow rates. It was found that, as nozzle inclination angle increased, the degree of asymmetry of the cooled region on the surface of the sample was increased and the overall rate of heat extraction decreased. The angle of inclination had a significant effect on ove...
Ironmaking & Steelmaking, 2004
The growth in demand for high quality metal alloys has placed considerable emphasis on the type o... more The growth in demand for high quality metal alloys has placed considerable emphasis on the type of cooling methods used in manufacturing processes, in particular, the production of highly tailored steel through controlled cooling on the runout table. The present study focuses on the heat transfer (cooling of hot rolled steel strips) on a runout table. The purpose of the study was to develop an efficient experimental method and collect temperature data under conditions similar to those that occur during industrial runout table conditions in a steelmill. Surface and internal temperatures were measured during transient cooling of a flat, upward facing fixed steel plate cooled by a highly subcooled single, circular, free surface jet of water. Measurements were made at stagnation and several streamwise distances from the stagnation point. A numerical, finite difference model was applied to calculate the surface heat flux using measured temperatures. The effect of water flowrate and subcooling on the overall heat transfer with emphasis on the maximum heat flux is discussed.
On the transition from partial to fully developed subcooled flow boiling
International Journal of Heat and Mass Transfer, 2002
The subject of the present study is to relate the boiling heat transfer process with experimental... more The subject of the present study is to relate the boiling heat transfer process with experimentally observed bubble behaviour during subcooled flow boiling of water in a vertical heated annulus. It presents an attempt to explain the transition from partial to fully developed flow boiling with regard to bubble growth rates and to the time that individual bubbles spend attached
steel research international, 2018
Accelerated cooling on the runout table of hot mills has become a key technology to produce therm... more Accelerated cooling on the runout table of hot mills has become a key technology to produce thermo-mechanically controlled processed (TMCP) steel plates and strips. During runout table cooling austenite decomposition takes place and determines the final microstructure and, hence, the properties of the hot-rolled steel. There is an increased tendency to produce higher strength TMCP steels with complex microstructures including bainite and martensite. To tailor these microstructures, it is required to carefully design runout table cooling paths and lower the cooling stop and coiling temperature, respectively, for producing flat products with homogeneous mechanical properties. Thus, simulation of runout table cooling is a crucial aspect of process modeling. In the present paper, the status of runout table simulation approaches is reviewed. In particular, the three boiling mechanisms of water cooling, that is, nucleate, transition, and film boiling are discussed. The development of appropriate heat transfer coefficients is rather mature for nucleate and film boiling, respectively. Modeling and controlling the transition boiling regime below the Leidenfrost temperature remains a challenge as heat extraction rates increase with decreasing steel temperature. The status of heat transfer simulations for transition boiling is thus discussed in detail. Currently, the proposed heat transfer correlations, while increasingly based on the underlying physics, still contain a number of empirical parameters that require tuning with experimental and/or mill data. The review is limited to information in the open literature while recognizing that a number of proprietary in-house runout table cooling models exist that are developed either by equipment makers or steel companies to control accelerated cooling to lower cooling stop or coiling temperatures. 
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Papers by Vladan Prodanovic