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This document discusses fluid mechanics and is authored by Streeter, Wylie, and Bedford. It likely covers topics such as fluid properties, fluid statics, fluid dynamics, flow measurements, dimensional analysis and similitude, internal flow, and external flow. The document provides an overview of fundamental fluid mechanics concepts and principles.

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“Fluid Mechanics,” Streeter, Wylie, and Bedford

Fa-Gung Fan

Atmospheric direct current (dc) corona discharge from thin wires or sharp needles has been widely used as an ion source in many devices such as photocopiers, laser printers, and electronic air cleaners. Existing numerical models to predict the electron distribution in the corona plasma are based on charge continuity equations and the simplified Boltzmann equation. In this paper, negative dc corona discharges produced from a thin wire in dry air are modeled using a hybrid model of modified particle-in-cell plus Monte Carlo collision (PIC-MCC) and a continuum approach. The PIC-MCC model predicts densities of charge carriers and electron kinetic energy distributions in the plasma region, while the continuum model predicts the densities of charge carriers in the unipolar ion region. Results from the hybrid model are compared with those from prior continuum models. Superior to the prior continuum model, the hybrid model is able to predict the voltage–current curve of corona discharges. The PIC-MCC simulation results also suggest the validity of the local approximation used to solve the Boltzmann equation in the prior continuum model.

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1. K /� a2 � �K ��D� 1� � � � � � E �� e � K a fluid � � e� � � E � � � “Fluid Mechanics,” Streeter, Wylie, and Bedford Fa-Gung Fan

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