OP-II-3

OP-II-19DESIGN AND OPERATION OF COMPUTER-CONTROLLED PULSEDMULTIJET LIQUID FEED FOR HEAT-TRANSFER DEVICESimakov V. 1,2 , Bodrov M. 1 , Nazarov A. 1 , Serov A. 11 Institute of Thermophysics SB RAS, Novosibirsk, Russia, sova3d@mail.ru2 Novosibirsk State University, Novosibirsk, RussiaPulse liquid feeds are often introduced into gas-solid systems through horizontalnozzles in many industry applications including chemical reactor engineering. Theinteractions of gas, particles and pulse spray play key roles in affecting processefficiency and product quality [1]. Good understanding of the fundamentalhydrodynamics and heat transfer of this phenomenon is essential to the designimprovement and optimization of chemical process.In the present work a pulsed source of gas-droplet multijets with control systemsupplied by computational soft program, sensors and apparatus for experimental pilotset up were developed to study heat transfer between water spray and heatexchanger. To provide on-line experimental study of a heat transfer between liquidjets and heating surface it was synchronized both detecting the numerous measuringparameters for every nozzle (time of liquid valve opening, pulse frequency,registration of two-phase jet towards vertical and horizontal axes, hydraulic pressuredrop and etc.) and their quick proper computation to obtain comprehensive analysis.The methods of registration, instrumentation and processing techniques forunsteady-state flow regime were also developed in this study and described indetails. During heat-transfer experiment a special attention was paid to reduce aparameter’s measurement time that includes time for system relaxation after thechanging experimental regime and time for registration of proper parameterresponse. The process of measurement is continuous to identify the end of atransient period and the beginning of the operating mode.Experimental set-up (Fig. 1) consists of the next main units [2, 3]: special digitalcalorimeter device connected with a heat-exchanger surface (1), programmablesource of multijet feed (2), and computerized registration system. During thegeneration of impulse jets the main parameters of water-droplet and air flows weremeasured as well as dynamic of liquid and gas spreading on the134