36 results about "Thermophysics" patented technology

A method of identifying a flaw in a part is provided that includes vibrating a part to induce heat. The heat originates in any flaws in the part. A thermal image is obtained using, for example, an infrared camera. A mathematical representation of the thermophysics, such as the heat conduction or thermal energy equations using the boundary element method or finite element method is used to identify a source and an intensity of the heat identified with the thermal image. Using the source and intensity of the heat, flaw characteristics for the part can be determined. The method is employed using an inspection system that includes a vibration device for vibrating the part. An imaging device, such as an infrared camera, measures temperature on the surface of the part. An assumption is made or additional measurements are taken to obtain values for surface flux or surface heat transfer coefficients. A processor communicates with the imaging device for receiving the surface temperature. The processor includes computer memory having part characteristics and mathematical equations. The processor uses the measured surface temperature, assumed or measured heat flux or heat transfer coefficients, part characteristics and mathematical equations to determine the flaw characteristics in the part.

The invention discloses a method for detecting and locating underwater heat sources based on layered filtering of water bodies, which belongs to the cross field of marine science, thermophysics and pattern recognition, and aims to perform layered filtering on water bodies, and determine the filtering by optimal criteria The depth accurately reflects the specific position of the underwater heat source. The invention comprises the thermal radiation simulation step of the underwater heat source in the water body, the step of acquiring the infrared image of the underwater target through actual measurement, the layered filtering step of the water body, and the detection and positioning step of the underwater heat source. The present invention constructs the thermal field model of the layered ocean water body, and further establishes a simplified underwater heat source including the thermal field model of the underwater vehicle. The results of the thermal field model of the underwater heat source in the water body can prove that the thermal radiation of the water body is Layered distribution; through the obtained infrared image and the layered theory of water body thermal radiation, the underwater heat source is detected and positioned by the method of water body layered filtering, which improves the accuracy of detection and positioning.

The invention discloses a thermal expansion coefficient measuring device based on engineering thermophysics. The thermal expansion coefficient measuring device comprises a support base, wherein a measuring shell is mounted at the top of the support base; a front transparent glass layer and a rear transparent glass layer are respectively arranged at the front end and the rear end of the measuring shell; a uniform heating mechanism is arranged inside the measuring shell; the uniform heating mechanism comprises heat conduction blocks which are arranged inside the measuring shell and are uniformlydistributed; holding cavities are formed inside the heat conduction blocks; electric heating plates are arranged inside the holding cavities; thermal expansion coefficient measuring mechanisms are arranged inside adjacent heat conduction blocks; a gantry is arranged outside the measuring shell; an adjusting photographing mechanism is arranged on the gantry. By adopting the thermal expansion coefficient measuring device, measurement of an object to be measured can be prevented from being affected by a measuring structure, meanwhile, temperatures inside the device can be uniformly distributed,the precision of measurement results can be ensured, in addition, thermal expansion coefficients of multiple objects can be simultaneously measured, multiple times of measurement can be carried out toobtain an average value, and thermal expansion coefficients of multiple objects can be simultaneously measured.

The invention discloses a method for measuring the natural convection temperature field of an overhead power transmission line by adopting a wheel-shaped thermocouple cluster driven by a stepping motor to drive a split bearing and fixing it. It mainly includes the following steps: S1. Even clusters are evenly fixed on split bearings driven by stepper motors. The distance between the temperature measuring contact of each thermocouple and the wire is different, and it is used to measure the temperature of the thermal field at different distances from the wire. S2. After splitting the outer ring of the bearing and rotating around the wire at a certain period, the temperature distribution at a specified position and a specified distance around the wire can be obtained. The present invention comprehensively considers the temperature field distribution of electric power overhead lines, measurement technology and engineering thermophysics, and can not affect the original temperature distribution as much as possible under the premise of relatively accurate measurement of the temperature field distribution around the overhead line .

The invention discloses an onsite thermal property testing method under the condition of a non-constant power. The trend of a heating power or cooling power changing with time is analyzed under the condition of power instability such as the interruption of a power supply and large fluctuation of voltage, and by dividing the non-constant power into a plurality of sections in terms of time, wherein, the power of each section is comparatively constant (the power can be considered as zero when heating or cooling are interrupted); the heat-transfer process of buried pipes is considered to undergo a plurality of step heating flux actions which are further disintegrated into a superposition of a plurality of thermal pulses; linear superposition principle is adopted for analyzing and a mathematical model is established; and ground thermal property parameters can be obtained by integrating the mathematical model with a parameter estimation method and other methods.

The invention belongs to the technical field of multi-phase fluid in power engineering and engineering thermophysics, and provides a single pump-controlled simple microscopic visualization system formulti-phase fluid injection. The single pump-controlled simple microscopic visualization system consists of injection drive, microscopic visualization and data collection. A single pump-controlled multi-phase fluid injection method is characterized in that a pressure difference produced by similar vacuum is used for sucking fluid into a middle piston container; the method can also be popularized to other experiment systems that need fluid injection; the method not only can be implemented at normal temperature and normal pressure, but also can be operated at high temperature and high pressure.The single pump-controlled simple microscopic visualization system has the advantages that the visualization study on the multi-phase fluid driving in a porous medium at the microscopic scale can be realized, and the injection drive part can complete the injection of multiple types of fluid by only one plunger pump; the suction and injection of different fluid can be completed without detachment of the experiment system, and the experiment system can be conveniently cleaned and dried; the experiment design is simple, the operation is convenient, and the number of intermediate containers and the cost of experiments are greatly reduced.

The invention discloses a plate type heat exchanging element for evaporation and condensation, belonging to the technical field of engineering thermophysics and energy and utilization. The heat exchanging element is characterized in that a specially designed strengthening heat transfer structure is arranged on the heat transfer zone of the element; a structure protruding to the condensation side plays a role of fixing and turbulence and a structure protruding to the evaporation side is in an inward depression configuration so as to form more corning points; a narrow seam with microscale effect, which is designed aiming at working liquid, is arranged between the structure and a flat bar; the height of the structure is an optimized value which is calculated according to characteristic values of detached diameter and capillary length of the working liquid, so as to cause generated bubbles to continuously absorb heat to grow up in the process of sliding between the flat bars after detaching from the coring points, thereby taking more heat away, updating the passed surfaces and accelerating liquid convection. The invention has the effects and benefits that the evaporative condenser consisting of the provided elements is in direct immersion type, and has the advantages of high heat transfer coefficient, convenient unpick and wash, uneasy corrosion and low energy consumption.