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Study on Compressible Oscillatory Flow and Heat Transfer in Circular Channel

Author: Zhang
Tutor: TangZuo
School: Zhejiang University
Course: Refrigeration and Cryogenic Engineering
Keywords: Compressible alternating flow Heat transfer Entrance effects Speed ??ring effect Nusselt number
CLC: TK124
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


Alternating flow is one of the important basic features of the thermoacoustic pulse tube refrigerator . The alternating flow of the fluid reciprocation , periodically through the heat transfer surfaces , and with the heat exchanger , which makes the flow and heat transfer process exhibit significantly different characteristics usually single direction flow . Depth study of the flow and heat transfer characteristics of alternating current has important significance for deepening understand thermoacoustic pulse tube refrigerator working mechanism to enhance the design capacity . In this paper, alternating compressible within the existing pipe flow study shortcomings , specifically to carry out the research work in the following areas : 1 . Pipe compressible alternating flow and heat transfer similar standards system analysis based on the unsteady flow of compressible viscous fluid general control equation , derived description compressible alternating tube flow and heat transfer phenomena similar standards system . Analysis and validation of mathematical models for the tube alternating flow establish a corresponding mathematical model , and analyze and verify the validity of the model . Tube compressible alternating stream flow inlet section length and heat transfer in the entrance length study based on tube compressible fluid flow and heat alternating spatial and temporal distribution characteristics , proposed evaluation indicators describe the flow and heat transfer in the development of CHD and CTD , the validity of the evaluation and validated by numerical calculation . 4 . Pipe compressible alternating quantitative study of the effect of flow speed ring is given based on the changes in the slope of the cross-sectional velocity distribution tube definition of the effect of the flow speed cyclic alternating phase analysis of the most significant draw speed ring effect , and in based on a quantitative evaluation of the effect of the speed ring CVAE . The use of the evaluation with dimensionless parameter variation for quantitative analysis of the the tube alternating flow speed ring effect . 5 . Pipe compressible alternating flow and heat transfer characteristics characterization using alternating flow and heat transfer performance in order Nusselt number table collection and management , and focus on the 0 - order Nusselt number Nuo ( Nusselt number ) with similar variation of the guidelines . 6 . Pipe compressible alternating flow and heat transfer experimental system based on the similarity principle experiment built on easily measured under normal temperature and pressure conditions , to determine the experimental program , and complete the appropriate structural design . Initially completed alternating flow generating device structures .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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