83 results about "Oscillatory flow" patented technology

The present invention provides a system and method for actively manipulating fluid flow over a surface using synthetic pulsators. Synthetic pulsators produce pulsed jet operable to manipulate the primary fluid flow proximate to the synthetic pulsator. The synthetic pulsator includes a synthetic jet actuator(s) operable to produce an oscillatory flow, and fluidic jet(s) operable to provide a continuous fluid flow. The oscillatory flow of the synthetic jet(s) and the continuous fluid flow of the fluidic jet(s) combine or mix to produce the pulsed jet operable to manipulate the primary fluid flow. These synthetic pulsators may then be actively manipulated to control the flow behavior of the ducted fluid flow, influence the inception point and trajectory of flow field vortices within the fluid flow, and reduce flow separation within the primary fluid flow.

An oscillating flow type tubular reactor with annular conic barrier plates is composed of oscillation generating mechanism, inlet segment with inlet, reaction segment formed by vertical circular reaction pipe with internal annular conic barrier plates for dividing its internal space into several chambers, and outlet segment with outlet. It is suitable for the reaction of liquid-solid suspension system with high content of solid.

A spirometer for measuring fluid flow, particularly associated with exhalation of respiratory patients. The spirometer of this invention preferably has a fluidic oscillator wherein the fluid oscillates within a chamber of the fluidic oscillator. An oscillation frequency of the fluid flow within the chamber is correlated to a flow rate. A computer is used to process input data, such as data representing frequency of the oscillatory flow within the chamber, to a flow rate passing through the spirometer. The spirometer of this invention may have no moving parts, which results in the need for only a design calibration and no periodic calibrations throughout use of the spirometer.

A valveless micropump for transforming a pressure variation of fluid in a volume variation chamber (8) into an oscillatory flow of fluid (10) by means of a piezoelectric element (7), making the fluid (10) to flow smoothly in channels (5, 6). A channel (2) is formed as an asymmetric diffuser-shaped channel (12) having a narrow channel (5) on the diffuser inlet (3) side and a wide channel (6) on the diffuser outlet (4) side, and the volume variation chamber (8) provided with the piezoelectric element (7) is communicated with the narrow channel (5). Vibration generated by applying a voltage to the piezoelectric element (7) causes a pressure variation of the fluid in the volume variation chamber (8) to generate a nozzle flow. The fluid (10) is made to flow smoothly from the wide channel (6) to the narrow channel (5) by the nozzle flow.

The invention belongs to the field of preparation of an energetic material and particularly relates to an active microfluidic platform-based CL-20 crystal form control method. An active microfluidic platform comprises an oscillatory flow driving unit, a steady flow driving unit, a recrystallization unit and a sample collecting unit. The method particularly comprises the following steps: putting anonsolvent solution into a sealing tank and putting a solvent solution into the steady flow driving unit; setting recrystallization temperature and pressure value and enabling the nonsolvent to flow towards a micro-mixer; setting parameters of the steady flow driving unit and enabling the solvent solution to flow towards the micro-mixer; collecting turbid liquid flowing out of the micro-mixer intothe sample collecting unit, and performing washing, suction filtration and drying to obtain CL-20 explosive particles; and changing experiment conditions and repeating the above steps until obtainingCL-20 explosives with different crystal appearance. The CL-20 explosive is prepared by the microfluidic platform, the structure is simple and small-dosage preparation can be realized; and furthermore, the experiment conditions are easy to adjust and the method is suitable for optimizing and screening the experiment parameters in the control process of the CL-20 explosive crystal form.

The invention discloses a method for producing bio-fuel (BF) from a high-viscosity biomass using thermo-chemical conversion of the biomass in a production line (10) with pumping means (PM), heating means (HM) and cooling means (CM). The method has the steps of 1) operating the pumping means, the heating means and the cooling means so that the production line is under supercritical fluid conditions (SCF) to induce biomass conversion in a conversion zone (CZ) within the production line, and 2) operating the pumping means so that at least part of the production line is in an oscillatory flow (OF) mode. The invention is advantageous for providing an improved method for producing biofuel from a high-viscosity biomass. This is performed by an advantageous combination of two operating modes: supercritical fluid (SCF) conditions and oscillatory flow (OF).

The invention belongs to the field of solar, and in particular relates to a distributed solar heat and power combination energy system. The system comprises an oscillatory flow heat pipe radiating solar photocell generation device, an oscillatory flow heat pipe heat collecting solar water heating device, a user power supply system and a user water heating system. According to the system, the solar generation device absorbs heat from the back side of a high temperature solar photovoltaic panel by using an oscillatory flow heat pipe, so that temperature of the photovoltaic panel is decreased, photoelectric conversion efficiency is significantly improved, and stable operation and power supply of the photovoltaic panel are ensured; the solar water heating device heats water in a hot water tank by using the oscillatory flow heat pipe heat collecting device to absorb photon heat; and a cooling water circulation device for the solar photovoltaic panel in the solar generation device and a hot water circulation device in the solar water heating device form a closed cooling water circulation loop to exchange heat, so that heat generated by the solar panel in light is utilized. The distributed solar heat and power combination energy system meets the requirement of a user for solar heat and power combination, and is applicable to power and heat supply for a single user or collective users.

A spirometer for measuring fluid flow, particularly associated with exhalation of respiratory patients. The spirometer of this invention preferably has a fluidic oscillator wherein the fluid oscillates within a chamber of the fluidic oscillator. An oscillation frequency of the fluid flow within the chamber is correlated to a flow rate. A computer is used to process input data, such as data representing frequency of the oscillatory flow within the chamber, to a flow rate passing through the spirometer. The spirometer of this invention may have no moving parts, which results in the need for only a design calibration and no periodic calibrations throughout use of the spirometer.

The invention discloses an oscillatory flow reactor of a packed bed. The oscillatory flow reactor comprises an oscillation generating mechanism, an inlet segment, a reaction segment and an outlet segment which are sequentially connected, wherein the inlet segment is composed of an air inlet segment and a liquid inlet segment which are connected in series, and the outlet segment is composed of an air outlet segment and a liquid outlet segment which are connected in series; the air inlet segment is provided with an air feeding hole and an air distributor located at the downstream of an air discharging hole; the liquid inlet segment is provided with a liquid feeding hole and a liquid distributor located at the downstream of a liquid discharging hole; the reaction segment is provided with a vertically-arranged reaction tube which is filled with filler or solid catalyst particles in the middle, a supporting device at the bottom and a pressing device at the top. The oscillatory flow reactor of the packed bed is suitable for industrial gas-liquid reaction taking the liquid phase as a main body, gas-liquid-liquid reaction or gas-liquid-solid three-phase reaction system containing a solid catalyst and can continuously and stably operate for a long term.

The invention relates to an oscillatory flow reactor used for preparing cumene hydroperoxide (CHP) in catalytic oxidation of cumene and a method for preparing CHP in catalytic oxidation of the cumene. The oscillatory flow reactor comprises a feed distribution section, a reaction section, a gas-liquid separation section and a condensation section; the feed distribution section comprises gas inlets, a gas distributor, a liquid inlet and a liquid-solid separator, and the liquid-solid separator is connected with an oscillation pump; the main body of the reaction section comprises a corrugated reaction tube with multiple sections which are in sectoral arc connection to form a concave-convex corrugated shape integrally, a heat tracing layer is arranged on the outer side of the corrugated reaction tube, and heat tracing medium enters from a heat tracing liquid inlet and flows out from a heat tracing liquid outlet; each of the upper, middle and lower section of the main body of the reaction section is provided with a temperature measuring point; the gas-liquid separation section is provided with a discharge hole with the liquid-solid separator, a safe injection hole and an electromagnetic valve and an electrically operated valve which are connected with the safe injection hole; the condensation section is of a double-layer tube shell structure, a gas exit is arranged in the tube layer, and a condensate inlet and a condensate outlet for the condensate medium are arranged in the shell layer. By the arrangement, quick reaction under lower reaction temperature and pressure is achieved, and meanwhile, higher CHP selectivity is acquired.

The invention discloses a closed loop capillary flat plate type solar heat collector, which belongs to the field of solar heat collector. The solar heat collector is characterized in that the device comprises a header tube, a fin tube, capillary metal tubes, a graphite heat transfer layer, a metal frame, plate glass and an insulation layer; the inner diameter of each capillary metal tube is between 2 and 5 millimeters, and the capillary metal tubes are connected with the fin tube to form a closed pipe system. The capillary metal tubes are filled with a heat transfer medium; during work, after absorbing solar energy, the heat transfer medium forms a vapor and liquid alternated column, enters the fin tube along the capillary metal tubes, flows back to the capillary metal tubes after being cooled down and condensed by media outside the tube, and then absorbs solar energy again for vaporization; and the cycle is repeatedly carried out. The closed loop capillary flat plate type solar heat collector has the advantages that the oscillatory flow heat pipe effect caused by the closed loop capillary metal tubes increases the heat transfer rate of the heat collector; the graphite heat transfer layer facilitates the improvement of the heat collection performance of the heat collector; and the tube diameter of each capillary metal tube is small, thereby improving the bearing capacity of the heat collection tube.

The invention relates to a continuous oscillatory flow membrane crystallization method of erythritol. The technical scheme is as follows: erythritol crystallization mother liquor is preheated and then sent into a hydrophobic hollow tubular membrane module; by arranging a circular baffle plate in the membrane module and producing oscillatory flow, fluid flowing and micromixing state on the surface of the membrane is remarkably improved, and the technical problem that concentration polarization is easy to happen in the membrane crystallization process or crystals on the membrane surface are easy to deposit and solvent out is effectively solved; water in the crystallization mother liquor entering the membrane module penetrates through the membrane in the form of water vapor and then is drawn out from the other side of the membrane by a vacuum pump and condensed into liquid water; the crystallization mother liquor which leaves the membrane module is concentrated to be saturated and then sent into a crystallizer; erythritol crystals undergo fluidization-suspension for growth; the upper layer of crystallization mother liquor in the crystallizer is pumped into the membrane module for internal circulation; and an erythritol crystallization product is led out of the lower part of the crystallizer. The method of the invention also has advantages as follows: continuous production is realized; and erythritol crystallization production cost can be effectively reduced.

The present invention concerns a method and an apparatus (10, 20) for a continuous preparation of organic peroxides, with the reactor comprising at least one flow channel (1, 1a, 1b) configured as a reaction zone; an inlet system (2) in fluid communication with a first end of the at least one flow channel and configured for introducing two or more substances or a combination of substances into the at least one flow channel; an outlet system (3) in fluid communication with a second end of the at least one flow channel, the second end being located downstream of the first end and the outlet system being configured for extracting a reaction product present at the second end; an oscillatory system (4, 5) configured for superimposing an oscillatory flow on the flow of substances passing through the at least one flow channel, the oscillatory being effected in at least a section of the at least one flow channel; and a controller configured to implement the method by controlling the inlet system to introduce, according to a first time characteristic, at least two substances or a combination of substances into the at least one flow channel, the oscillatory system to superimpose an oscillatory flow on at least a part of the flow of substances passing through the at least one flow channel, and the outlet system to extract, on an ongoing basis, the reaction product formed in the flow channel from the substances introduced such that the output mass flow rate corresponding to the sum of the input mass flow rates.