Investigation of deposition characteristics on tube-bundle heat exchanger with an improved ash particle model

Xu, Zhiming; Li, Jinhui; Han, Zhiyu; Yang, Xinrui

doi:10.1016/j.powtec.2022.118027

Cited by 9 publications

(1 citation statement)

References 25 publications

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“…Based on the expression of the parameters in the particle deposition model [22,23] given by Equation ( 1), we developed a set of MATLAB programs to visualize the simulation of the deposition process of sand dust particles on a resistor. This program requires several input values, including the actual atmospheric pressure, ambient temperature, roughness of the deposition surface, diameter of the particle molecules, particle density, and acceleration, among others.…”

Section: Principle Of Measuring Electrical Characteristicsmentioning

confidence: 99%

Characterization of Sand and Dust Pollution Degradation Based on Sensitive Structure of Microelectromechanical System Flow Sensor

Chen,

Wen,

Huang

et al. 2024

Micromachines

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The effect of sand and dust pollution on the sensitive structures of flow sensors in microelectromechanical systems (MEMS) is a hot issue in current MEMS reliability research. However, previous studies on sand and dust contamination have only searched for sensor accuracy degradation due to heat conduction in sand and dust cover and have yet to search for other failure-inducing factors. This paper aims to discover the other inducing factors for the accuracy failure of MEMS flow sensors under sand and dust pollution by using a combined model simulation and sample test method. The accuracy of a flow sensor is mainly reflected by the size of its thermistor, so in this study, the output value of the thermistor value was chosen as an electrical characterization parameter to verify the change in the sensor’s accuracy side by side. The results show that after excluding the influence of heat conduction, when sand particles fall on the device, the mutual friction between the sand particles will produce an electrostatic current; through the principle of electrostatic dissipation into the thermistor, the principle of measurement leads to the resistance value becoming smaller, and when the sand dust is stationary for some time, the resistance value returns to the expected level. This finding provides theoretical guidance for finding failure-inducing factors in MEMS failure modes.

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Section: Principle Of Measuring Electrical Characteristicsmentioning

confidence: 99%