Measuring device for equivalent thermal conductivity of non-Newtonian fluid in shear flow
A non-Newtonian fluid and measuring device technology, applied in the field of physical measurement, can solve problems such as lack of mature measurement technology
Active Publication Date: 2012-09-19
XI AN JIAOTONG UNIV
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Problems solved by technology
At present, there are no related patent publications on the measurement of fluid thermal conductivity in the shear flow field at home and abroad, and there is no mature measurement technology on the market
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[0054] Using this device, the equivalent thermal conductivity of different nanofluids (particle diameter d=10nm, 4 different volume fractions Φ=1.96, 3.92, 8.57 and 12.85%) at different shear rates were measured, as Figure 5 shown. It can be seen from the figure that the equivalent thermal conductivity ke of the nanofluid increases with the increase of the shear rate γ, and the larger the volume fraction, the greater the thermal conductivity. It can be seen that the measurement device can accurately measure the equivalent thermal conductivity of nanofluids (a typical non-Newtonian fluid), and explore the flow effect of the thermal conductivity of non-Newtonian fluids.
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The invention discloses a measuring device for the equivalent thermal conductivity of a non-Newtonian fluid in a shear flow. The measuring device comprises a rotating system and a heating system, wherein the rotating system consists of two coaxial cylinders; the inner cylinder is fixed and the outer cylinder rotates; the heating system comprises a heating film attached to the inner wall of the inner cylinder and is connected with an adjustable direct current power supply; a resistance thermometer connected with a temperature display screen is also arranged on the inner cylinder; a circulating cup filled with constant temperature water is arranged on the outer side of the outer cylinder; a thermoelectric thermometer is arranged in the constant temperature water close to the wall surface of the outer cylinder; a water inlet pipe and a water outlet pipe are arranged on the circulating cup; and the constant temperature water is connected with a constant temperature water bath through the water inlet pipe and the water outlet pipe. According to the measuring device disclosed by the invention, the equivalent thermal conductivity of the typical non-Newtonian fluid at different shear speed rates can be completely and accurately measured.
Description
technical field [0001] The invention belongs to the technical field of physical measurement, and relates to a measuring device for the equivalent thermal conductivity of a fluid in a shear flow field, in particular to a measuring device for the equivalent thermal conductivity of a non-Newtonian fluid in a shear flow field. Background technique [0002] As an important thermophysical property of fluids, thermal conductivity is widely required in engineering applications, especially when numerical methods are used to analyze fluid flow and heat transfer processes. At present, many fluids used in industry exhibit non-Newtonian properties; for non-Newtonian fluids, its thermal conductivity is not only related to the fluid itself, but also related to its flow environment. However, due to the lack of theoretical support and effective testing methods, people often use the static thermal conductivity to replace the equivalent thermal conductivity of the fluid in the flowing state, w...
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Inventor 孙成珍白博峰卢文强
Owner XI AN JIAOTONG UNIV