Viscosity and other properties are determined at desired temperatures in drilling mud and other fluids by using a versatile cavitation device which, operating in the cavitation mode, mixes and heats the fluid to a specified temperature, and, operating in the shear mode, acts as a spindle for application of Couette principles to determine viscosity as a function of shear stress and shear rate. The invention obviates the practice of adjusting rheology of a drilling fluid by passing it through the drill bit. Drilling fluid may be managed by a straight-through method to the well, or by placing the cavitation device in a loop which isolates an aliquot of known volume and circulating the fluid through the loop including the cavitation device. A controller may be programmed to manage the viscosity and other properties at various temperatures by controlling the power input and angular rotation of the spindle (which has cavities on its cylindrical surface), and feeding viscosity-adjusting agents and other additives to the fluid. Data may be collected from the loop and used in the straight-through mode until it is determined that conditions require a new set of data, or the loop may be used continuously. The system may be used with a supplemental viscometer, density meter, and other instruments.

Viscosity and other properties are determined at desired temperatures in drilling mud and other fluids by using a versatile cavitation device which, operating in the cavitation mode, mixes and heats the fluid to a specified temperature, and, operating in the shear mode, acts as a spindle for application of Couette principles to determine viscosity as a function of shear stress and shear rate. The invention obviates the practice of adjusting rheology of a drilling fluid by passing it through the drill bit. Drilling fluid may be managed by a straight-through method to the well, or by placing the cavitation device in a loop which isolates an aliquot of known volume and circulating the fluid through the loop including the cavitation device. A controller may be programmed to manage the viscosity and other properties at various temperatures by controlling the power input and angular rotation of the spindle (which has cavities on its cylindrical surface), and feeding viscosity-adjusting agents and other additives to the fluid. Data may be collected from the loop and used in the straight-through mode until it is determined that conditions require a new set of data, or the loop may be used continuously. The system may be used with a supplemental viscometer, density meter, and other instruments.

The present disclosure relates to a method for preparing an oil-in-water mixture having a predeterminable oil concentration which can be used as a reference mixture in the determination of oil concentrations of oil-in-water mixtures, comprising the steps of arranging at least one oil storage element in a container, feeding a predeterminable amount of a water-containing fluid into the container; and introducing ultrasonic waves into the fluid that are emitted in the direction of the oil storage element covered by the fluid, wherein the oil received in the oil storage element is released from the oil storage element by means of ultrasonic waves acting on the oil storage element and is distributed in the fluid. The present disclosure further relates to an apparatus for preparing an oil-in-water mixture.

Provided is a microbubble generating device with a simple structure that can stably and continuously discharge microbubbles in larger volumes from a discharge section. The microbubble generating device is provided with: a liquid introduction section 2 for introducing a liquid L1 within a tank T; a gas introduction section 3a for introducing a gas; a pressure feed section 4 for pressure feeding a liquid fluid L2 fed via the liquid introduction section 2 and the gas fed via the gas introduction section 3a; a microbubble generating section 5 for generating microbubbles B in the liquid fluid L2 pressure fed by the pressure feed section 4 and discharging the liquid fluid to the liquid L1; and a discharge flow rate adjustment section 55 for adjusting the discharge volume of the liquid fluid L2.

A method is provided for producing fine-bubble water by resonance foaming and vacuum cavitation, and a device for manufacturing each of ultra-fine-bubble water of hydrogen gas having a reducing radical function, ultra-fine-bubble water of air and oxygen gas having an oxidizing radical function, ozone ultra-fine-bubble water having a sterilization function enabled by ozone, and fine-bubble water of nitrogen/carbon dioxide gas for increasing the ability to preserve the freshness of raw agricultural products, livestock products, and marine products.

A mechanism is described for facilitating controlled cavitation of medicines and cosmetics. A method of embodiments, as described herein, includes facilitating, by one or more processors of a controlled cavitation device, controlled cavitation dispersion for de-agglomeration of a compound that is agglomerated and represents a mixture of ingredients associated with a medical drug or a cosmetic item. The method may further include generating the medical drug or the cosmetic item based on the controlled cavitation dispersion of the compound.

A method is provided for producing fine-bubble water by resonance foaming and vacuum cavitation, and a device for manufacturing each of ultra-fine-bubble water of hydrogen gas having a reducing radical function, ultra-fine-bubble water of air and oxygen gas having an oxidizing radical function, ozone ultra-fine-bubble water having a sterilization function enabled by ozone, and fine-bubble water of nitrogen/carbon dioxide gas for increasing the ability to preserve the freshness of raw agricultural products, livestock products, and marine products.

A minute bubble generator includes a flow path member including a flow path allowing a liquid to pass therethrough; and a colliding part provided in the flow path and generating minute bubbles in the liquid passing through the flow path by locally reducing a cross sectional area of the flow path. The colliding part is formed integrally with the flow path member and is provided closer to an upstream end or a downstream end relative to a lengthwise center of the flow path.

A bubble generation device includes: a metallic narrow tube (10) through which water passes; and a pump that pressure-feeds the water containing a gas component into the metallic narrow tube (10). A drawer (11) in which a path through which the water passes is narrower than the front and the rear thereof in the flow direction of the water is disposed on the inside of the metallic narrow tube (10). The drawer (11) has the rectangular cross section orthogonal to the flow direction. The gas component contained in the water is dissolved in the water by pressure-feeding the water to the drawer (11), bubbles are evolved due to a decrease in pressure in the drawer (11), turbulent flow is generated in the water in the drawer (11) to crush bubbles in the water by the shearing force thereof, and bubbles are crushed by a shock wave caused by transonic flow occurring in the water that has exited from the drawer (11).

An apparatus configured to generate generating water comprising nano bubbles of molecular hydrogen on demand. The apparatus is connected to a water supply with a valve and comprises a pump which supplies pressurized water to a venturi gas liquid mixer that also receives a supply of Hydrogen gas. The mixed hydrogen gas/water steam is provided to a nano bubble generating apparatus that uses cavitation to generate nano bubbles of Hydrogen in the water. The Hydrogen nano bubbles have diameters of less than 200 nm and a concentration of up to 1.2 ppm. Further the concentration remains with 85% of the output concentration for at least 12 hours.