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Double-pipe relative measurement method and device for microflow of liquid

A technology of relative measurement and micro-flow, which is applied in the direction of measuring devices, fluid flow, hydrodynamic tests, etc., can solve problems such as the inability to improve the accuracy of pipe diameter measurement, and achieve the goal of improving relative measurement accuracy, eliminating the influence of geometric errors, and high precision Effect

Inactive Publication Date: 2009-02-18
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

Under the circumstances that the measurement accuracy of the pipe diameter cannot be improved at present, people hope for a high-precision, simple and easy-to-use dual-pipe relative measurement method and device for liquid microflow to reduce the influence of the absolute measurement error of the flow rate under different working conditions.

Method used

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  • Double-pipe relative measurement method and device for microflow of liquid
  • Double-pipe relative measurement method and device for microflow of liquid
  • Double-pipe relative measurement method and device for microflow of liquid

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0037] Measuring principle of the present invention is as follows:

[0038] Take the measurement of the wall effect of water in a micropipe as an example. Two parallel capillary micro-channels a and b are used as the experimental objects, one of them, for example, the inner surface of tube a is treated with OTS molecular film to become a hydrophobic surface, and the inner wall of the other capillary micro-channel b is not treated, so that the two Under the same pressure and temperature, a capillary microtube is tested for the flow characteristics of water, and the following can be obtained:

[0039] Q a - water = π d a 4 P ...

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Abstract

A double-tube relative measuring method of liquid micro-flowing includes providing two micro-tube being connected to pressure source, measuring out flow rate Q1 a and Q1 b of the first liquid in two said micro-tubes, providing the second liquid and maintaining its physical parameters to be constant in two micro-tubes test, measuring out flow rate Q 2 a and Q 2 b of the second liquid in two said micro-tubes and then calculating out apparent viscosity coefficient ratio of C = ( Q 1 a / Q 1 b ) / ( Q 2 b / Q 2 b ). The device used for realizing said method is also disclosed.

Description

technical field [0001] The invention relates to a method and a device for liquid micro-flow characteristics, in particular to a method and a device for relative measurement of liquid micro-flow dual pipes that eliminate the influence of pipe diameter measurement errors. Background technique [0002] At present, the methods for measuring the pressure and flow characteristics of liquid emblem flow mainly include: [0003] For example, Patent 1: Patent No. ZL02285488.6, titled "A Device for Measuring Liquid Viscosity", discloses a gas-driven low-pressure micro-flow test bench. [0004] For example, Patent 2: Patent No. ZL01279794.4, titled "High-pressure Micro-flow Liquid Flow Experimental Device", discloses a liquid-driven high-pressure micro-flow test bench. [0005] The measurement accuracy of the devices disclosed in the above two patents is mainly affected by the error of the pipe diameter. When the pipe diameter error is 3um, the uncertainty of the experimental data can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00F15D1/02
Inventor 崔海航李战华刘宗源
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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