The paper presents polymer-micellar aggregates as efficient drag reducers of the energy losses in straight pipe flow. A small amount of high molecular polymers: Polyethylene Oxide, Cetyltrimetyl Ammonium Bromide surfactant and Sodium Salicylate salt additives, are applied to obtain polymer-micellar aggregates formation. An analysis of how polymermicellar additives influence the shape and character of flow resistance curves has been performed. It is documented that for polymer-micellar solutions the stable transitional zone between, the laminar and the turbulent flows are extended toward higher values of the Reynolds number. Occurrence of the third turbulent zone of drag reduction is also observed.

The paper presents an analysis of valves used for closing and opening production tubing, located on the production line. The main safety valves analysed in this work are located in the Christmas Tree and in the Downhole Safety Valve. The analysis was conducted using FMEA; it found that for each basic Christmas Tree’s gate valve, the most dangerous failure modes are external leaks and “fail to close” in the open position of the valves. For the Downhole Safety Valve, the most dangerous fault can occur in the open position of the valve. The Downhole Safety Valve and the Christmas Tree complement each other, thus ensuring safety during oil and gas production.

The study on system-wide and structural properties of a prepolyamidation tank were performed by simulation. Control channels were selected. An algorithmical synthesis of a tank optimal control system was performed. A designed control system was simulated.

In the paper analysis of the factors influencing the efficiency of the rectification process is provided. The authors show that existing dependences, equivalent to HETP, cannot be used for calculating rectification plate columns and columns with vortex nozzles, in which the coefficients of mass transfer are substantially dependent on the irrigation density and the gas/steam velocity. The dependence of the efficiency of the packet vortex nozzle as a function of the hydrodynamic regimes of the vapour and liquid phases is proposed.

In this paper, the ways of intensification of technological processes by means of powerful short pulses of energy in activation machines in solid phase and water systems are considered. The mechanism of accumulation and relaxation of energy for the substances subjected to mechanical activation is shown.

This paper presents comparison of calculation methods of the required thickness of the tube sheet in the shell and tube heat exchanger compatible with the standards of the European standard PN - EN 13445-3, and the guidelines of the Polish Office of Technical Inspection (UDT). Details of the methods are illustrated by numerical examples – (calculations) for the selected design of the tubesheet.

In this contribution, it is explained in the detail how useful Microsoft EXCEL could be for thesimulation of process lines. The report contains a manual flowsheet as well as a tutorial case and the results of its application for Nitric acid production can be gained.

The paper presents the results of encapsulation of biologically and chemically active ingredients, such as living cells and drugs within multiple emulsions and release coencapsulated drugs with the rate controlled by physicochemical properties of emulsions. The influence of process parameters in a Couette-Taylor flow bioreactor on the obtained emulsions structures, rate and mechanisms of release and the possibility to modify the release profiles have been discussed and presented.

The aim of the article was the analysis of liquid flow of radial-axial circulation in the mixing vessel equipped with a dual impeller set, of which the lower impeller induces radial-axial liquid stream, while the upper is turbine disc impeller with vertical blades, ejecting the liquid radially. On the basis of measurements of the liquid instantaneous velocity, the circulation flow rate was evaluated and supplemented with the exchange flow rate – occurring between adjacent compartments. The usage of a CMA model allows to describe the cycle of liquid transport.

The paper summarises the noise measurements of a bobbin cutting machine, also referred to as a longitudinal paper cutter machine, taken as a part of the procedure involved in the declaration of compliance of the machinery. Noise measurements were taken with a view to improve the conditions in the work environment. Due to the machine operation, noise level conditions were determined by testing the impulse response inside the machine room. Calculations were carried out in an attempt to improve the working conditions for machine operators.

The paper deals with experimental research of the waste suspensions mixing from the energy industry. Mixing experiments were carried out in a transparent baffled vessel with a diameter of 290 mm. Standard pitched six-blade turbine and folded four-blade turbine with diameters of 100 mm in two relative distances from bottom H2/d = 1 and 0.5 were used in experiments. Measurements were carried out with three volumetric concentrations of suspensions: 16, 31.5 and 47%.

The article shows prospects of using regeneration and utilisation rotary systems of waste technological liquids in enclosed local water systems.

The article describes the structure and operation of virtual one-dimensional dynamic model of the solar heating system using components from the libraries of the EcosimPro program. The model is based on a fragment of a real hybrid sorption-compressor refrigeration system, designed and built in the Laboratory of Thermodynamics and Thermal Machines Measurements at the Faculty of Mechanical Engineering of the Cracow University of Technology. In the second part of the paper, the results of the dynamic simulation are shown along with their comparison to the actual measurement data recorded during one day (and night).

In this paper we propose the process of formation of cavitation bubbles in the pilot valve, considered as the steady and homogeneous Markov process.

We propose a method for forming differential of the distribution functions of the number of particles of bulk materials on the angle of reflection from bumper (baffle) plate.

The paper presents a method for monitoring the flow conditions in pipelines in the case of transport of crystallising water slurries forming scale. The method’s core is the ability to calculate the equivalent pipeline diameter under varying flow conditions in industrial practice. The method was successfully tested in the laboratory and employed in an industrial plant.

The paper presents an analysis of gaseous emissions arising from the operations of printing using a printing process hot offset rotary. The first part presents the general characteristics of the process and the paint used. The following part shows the results of modelling the emission of pollutants according to the efficiency of the cleaning system, as well as depending on other parameters influencing the dispersion process impurities.

In the paper, the mathematical model of combined polymerisation and drying of polyacrylamide prepolymer is presented. It allows to predict the change of monomer conversion degree, polymer moisture content, the temperatures of gas and polymer in the dryer as well as dryer sizes. Using a developed model, values of technological parameters were established, providing faster polymerisation than in the case of drying.

The paper presents the results of experimental investigation of the hydrodynamics in unbaffled stirred vessel with eccentric Rushton turbine configuration. Basing on flow visualisation. the main flow features were determined. Laser Doppler Anemometry measurements provided radial and axial components of the mean flow velocity vectors. The obtained data of power consumption allowed to determine the impact of the impeller eccentricity ratio e/R on the power number Ne.

The research on the influence of the initial moisture content of seeds, of the duration of IR drying, of temperature regime on the effect of stimulation and keeping the effect with time, was carried out. A mathematical model for the dynamics of heating a seed layer, taking into account the moisture evaporation, is developed. Paper presents experimental data on mass conductivity properties for a dried layer of seeds, the recommendations for process equipment design are given.

The study evaluated the impact of emissions (VOCs) as a result of the operation of the printing of plant at working positions of those performing their tasks outdoors or in buildings next door. The first part of the paper presents the general characteristics of the process and materials used for printing. The further part shows the results of the modelling of emissions, depending on the operating state of purification (emission in normal conditions and emission in failure state of the afterburner).

The results of experimental studies confirm the suitability of non-freezing liquids for use as dust collecting liquids in equipment working at low temperatures. Based on the completed studies, the hypothesis regarding the impact of liquid viscosity on the effect of releasing the surface collecting the dust particles and, therefore, on the efficiency of the dust collection process cannot be clearly verified. Decreasing the efficiency of dust collection correlated with the increase of liquid viscosity is likely an effect of changing the conditions for the formation of liquid dust collectors.

The paper presents the results of a study involving the impact of sudden change of crosssectional area on the flow patterns and local pressure drops for flow of multi-phase mixture. The experiment was conducted in the conditions of a horizontal and vertical flow through a measuring channel. Pressure drops calculated on the basis Kawahara and Lottes methods are compared with experimental data. A system of two interconnected pipes with internal diameters of 40 and 22 mm as well as 46 and 16 mm and a total length of 7 m formed the measurement channel. The experiments involved air, water and oil.

This paper presents an analysis of selected operating parameters of a cyclone with a modified inlet. The modification consisted in an angular arrangement of an inlet channel wall. This can result – in view of previously conducted experiments – in a faster insertion of a dusty gas into a swirl motion, an improvement of particles separation process. The analysis was carried out using numeric CFD simulations. The results were compared to those obtained from simulations and lab-measurements for a cyclone with standard inlet.