tailieunhanh - HEAT TRANSFER THEORETICAL ANALYSIS, EXPERIMENTAL INVESTIGATIONS AND INDUSTRIAL SYSTEMS_3

Tham khảo sách 'heat transfer theoretical analysis, experimental investigations and industrial systems_3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 3 Heat Transfer Phenomena and Its Assessment 13 Quantitative Visualization of Heat Transfer in Oscillatory and Pulsatile Flows Cila Herman Department of Mechanical Engineering The Johns Hopkins University USA 1. Introduction Oscillatory and pulsatile flows arise in a variety of engineering applications as well as in nature. Typical examples include blood flow breathing flow in some pipe systems acoustic systems etc. Typical engineering applications include enhancement of heat transfer and species transport chemical species separation flow control flow velocity measurement equipment calibration and biomedical applications. Very often these flows are accompanied by heat or mass transfer processes. During the past four decades numerous studies have addressed issues specific for purely oscillatory and modulated or pulsatile flows oscillatory flow superimposed on a mean steady flow . Recent advances in the study of oscillatory flows were reviewed by Cooper et al. 1993 and Herman 2000 . A better understanding of these flows and the accompanying heat transfer processes is essential for the proper design of equipment for such processes and physical situations. Both the experimental study and the computational modeling of oscillatory and pulsatile flows pose specific challenges which will be addressed in this chapter with the emphasis on quantitative experimental visualization using holographic interferometry. Experimental visualization of oscillatory and pulsatile flows and heat transfer requires non-invasive measurement techniques to avoid affecting the investigated process. In this chapter we discuss holographic interferometry HI as a powerful tool in the quantitative visualization of oscillatory and pulsatile flows and heat transfer. Two situations will be considered to demonstrate the applications of the method i the study of self-sustained oscillatory flows and the accompanying heat transfer in grooved and communicating channels and the study of ii oscillatory .

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