## 2 Description of the Experimental Device  
The hydrate formation process was carried out in two high pressure vessels. The developed prototype experimental device consists of a closed circuit, where the dynamic effect of water atomization in the nozzle is used to produce hydrate. Synthetic production of natural gas hydrates depends on the rapid formation of suitable gas-liquid bonds. For this reason, the method of injecting water droplets into a gaseous substance was chosen. Atomized water moves at a relatively high velocity in a volume of gas compressed to a high pressure (on the order of 1 to 10 MPa), coming into contact with the gas in a turbulent environment, which also causes a disturbance of the surface tension of the liquid in the form of a tiny droplet. The force at the interface of two liquids that do not mix increases until the surface tension cannot hold the mass of water together and droplets of even smaller diameters are formed by the action of the gas. By increasing the external surface area of the water and making it flow in a gas environment, we achieve more intense contact with the gas, which is a critical factor for rapid and favorable hydrate formation. This hydrate generation process is an exothermic reaction with the generation of reaction heat. The heat generated in hydrate formation can be efficiently dissipated in the liquid fraction of water due to its large heat capacity. The process of water-gas interaction causing hydrate formation occurs in two steps. The first step is nucleation to form a new thermodynamic phase. During nucleation, the natural gas spreads in the volume of water. The bound methane and other components of the natural gas crystallize in the aqueous component to form the initial hydrate structures. In a second step, the resulting nuclei increase in size and begin to clump together. Subsequently, the fine particles of the formed hydrate flow continuously into a second vessel, where the process of trapping the final product occurs using a micron sieve to filter the solid particles of hydrate from the water. The mixture of gas and water flows in a closed circuit, which makes it possible, among other things, to reduce the cost of driving the pump. The aim is to focus on a model for the formation of natural gas hydrates by using a circulation pump until the desired hydrate structure is formed. This will increase the interaction of hydrocarbon gas and water molecules, which can significantly accelerate the hydrate formation process. The last technological operation is the process of dehydration and cooling of the hydrate. Excess water is removed to reduce the total volume of the resulting hydrate. The resulting hydrate is dried by a cold stream of natural gas expanded behind the nozzle. The temperature of such gas is also significantly reduced due to the Joule-Thomson effect. Temperature sensing was carried out using NiCr-Ni thermocouples for which the uncertainty is defined: Class 1: \(\pm\)1.5 \({}^{\circ}\)C or \(\pm\)0.004 x /t/ (\(-\)40 to 1000 \({}^{\circ}\)C). The pressure was measured by a piezoresistive sensor with an accuracy of 0... -400 bar \(\pm\) 0.25% at a temperature range of 0... -+70 \({}^{\circ}\)C. Type B uncertainty. Due to the flow of the medium at high pressure, the flow measurement was carried out non-invasively using a Yokogawa ultrasonic flowmeter. The main advantage of this ultrasonic flowmeter is the surface installation directly on the piping system. Ultrasonic flow sensor: US300 PM has a defined measurement uncertainty of 1%. Type B uncertainty. Figure 1 shows the experimental setup in schematic form. The individual reference lines of the technological devices with numerical designations are specified in more detail in the following Table 1.  
The plunger pump used in the experiment has an output of 5.5 kW, along with a working pressure adjustable between 40 and 250 bar. The motor has a speed of 1450 rpm. We used a frequency converter to control the motor speed, for the sake of setting the desired flow rate during the experiment.