Developing Adiabatic Two-phase Flow

Developing Adiabatic Two-phase Flow

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In order to understand the characteristics of the adiabatic development of two-phase flow this study was performed using H2FC-CF 3 - 1, 1, 1, 2-Tetrafluoroethane (R134A) as a working fluid in three different transparent tubes. The flow was visualized using a high speed camera. To better (faster and more objectively) analyze the flow, a technique was developed to determine the separation distance using a statistical method known as Change Point Analysis. The distance at which the phases become separated can be an important parameter in design of inlet tubes to evaporators. A method for determining the void fraction from the visualization results was developed and presented. This method allows for a local, instantaneous or time averaged, void fraction determination in Stratified, Intermittent, and Annular flows and could conceivably be implemented into an online void fraction determination. Qualitative examination of these images allowed for the determination of the distinct regions of flow development: Well-Mixed, Separating, Separated but Developing, and Developed regions. Dynamic examples of transitions between flow regimes in the process of flow development were also presented; specifically, transitions from Stratified to Intermittent flow.For this reason, initial studies of flow development in a realistic automotive air- conditioning system were undertaken to ... The system used for this purpose was a modified 2007 Toyota Camry air-conditioning system (different evaporator), ... Condenser Figure 7-1: System Schematic for Two-Phase Flow Development in 148.

Title:Developing Adiabatic Two-phase Flow
Author:Chad D. Bowers
Publisher:ProQuest - 2009


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