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Experimental Study on the Relationship between the Optimum Oscillatory Frequencies for Pulsatile Flow

Author: LiuChunQing
Tutor: BianYongNing
School: Dalian University of Technology
Course: Fluid Mechanics
Keywords: Optimal vibration frequency Pulsatile flow Electrochemical techniques Mass transfer enhancement Wave wall pipe
CLC: O353
Type: Master's thesis
Year: 2011
Downloads: 19
Quote: 0
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Abstract


Hydrodynamic characteristics of two-dimensional and three-dimensional flow path within the fluid mass and heat transfer enhancement mechanism as the basic structural unit of heat transfer equipment, has attracted widespread attention. The experimental and numerical simulation studies have been three-dimensional wave wall under pulsatile flow tube mass and heat transfer enhanced vibration frequency in different operating conditions, but the relationship between the various best vibration frequency is not yet clear. This article focuses on the flow characteristics within the three-dimensional sine wave wall tube under pulsatile flow, emphasis on the relationship of the mass transfer enhancement and the vibration frequency under different operating conditions within the three-dimensional sine wave wall tube under pulsatile flow, and under different operating conditions best frequency, and thus a clear relationship between the optimal vibration frequency under different operating conditions for efficient heat and mass transfer equipment design and transfer enhancement technology, scientific research reference. The specific content of this paper is as follows: the first chapter summary of existing research progress at home and abroad, on the characteristics of the flow within the various shapes under different flow field of two-dimensional and three-dimensional flow path. As of the current research results show that the unsteady flow field within the two-dimensional and three-dimensional flow path results more mature, experimental and numerical simulation results are consistent; under pulsatile flow, as opposed to the two-dimensional flow path of research, the three-dimensional The flow path of research is still insufficient, especially in determining the optimum operating conditions for the three-dimensional wave wall tube heat and mass transfer, has yet to be complete and in-depth. The second chapter describes the method of operation of the experimental apparatus used in this study, the experimental principle and relevant experimental equipment. The experimental apparatus includes the wave wall pipe flow system and electrochemical measurement system, the experiment will be related to fluid mechanics theory based on the mass transfer rates, the electrochemical techniques used in this experimental study. The third chapter gives the optimum vibration frequency, thereby to find the relationship between the different operating conditions and the optimum vibration frequency of the relevant test results, and under different operating conditions. Experimental results show that the vibration frequency on mass transfer enhancement has a significant effect, there is a guide to the optimum vibration frequency of the maximum mass transfer enhancement effect different vibration fraction as well as the net flow Reynolds number res under conditions are; improve pulsation vibrating fraction helps pass quality enhancement, and moderate net flow Reynolds number Res can obtain better mass transfer enhancement effect; the different vibrations fraction optimum vibration frequency net flow Reynolds number Re. Was decreasing linear relationship, and the as the Vibration fraction increases, the net flow Reynolds number Res increases. The above results for the actual transfer of the heat exchanger strengthen the operation has important guiding significance. Chapter IV summarizes the results of this study. Specified in Chapter V of the content of future expansion.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Fluid vibration and wave
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