Instrumentation, Measurements, and Experiments in Fluids
暫譯: 流體儀器、測量與實驗

《流體中的儀器、測量與實驗》第三版提供一套完整且適合學生學習的流體實驗指南，闡明核心原理，同時讓讀者掌握進行進階研究所需的現代工具與方法。本書承襲前幾版在全球廣受好評、易於理解的特色，並進一步改善用語、強化說明，以及精簡內容編排，協助讀者快速吸收。新增的低溫風洞（cryogenic wind tunnel）詳細介紹液態氮冷卻，以及高雷諾數（high-Reynolds-number）測試，讓實驗條件更能逼近實際飛行狀態。此外，本書也為授課教師提供配套的《解答手冊》（Solutions Manual），其中包含完整的解題過程與課堂投影片。

主要特色：

• 強化「質量流量與體積流量測量」章節，明確說明實務上的限制，包括轉子流量計（rotameter）與阻力體（drag body）的限制、低流量測量的不準確性、污染問題，以及容易磨損的特性

• 透過重新修訂的專章闡明類比方法（analogue methods），聚焦於水流通道、核心原理與功能、複雜流動型態的視覺化，以及實務上的模擬與建模

• 涵蓋風洞測試（wind tunnel testing）的最新趨勢，並從測試氣體到操作與應用層面，詳細介紹低溫風洞（cryogenic wind tunnels）

• 強化光學流動視覺化技術（optical flow visualization techniques）重要面向的內容

• 收錄大量範例、習題、課堂投影片與解答手冊

Ethirajan Rathakrishnan is professor of Aerospace Engineering at the Indian Institute of Technology Kanpur, India. He is well-known internationally for his research in the area of high-speed jets. The limit for the passive control of jets, called the Rathakrishnan Limit, is his contribution to the field of jet research, and the concept of breathing blunt nose (BBN), which simultaneously reduces the positive pressure at the nose and increases the low pressure at the base is his contribution to drag reduction at hypersonic speeds. Positioning the twin-vortex Reynolds number at around 5000, by changing the geometry from cylinder, for which the maximum limit for the Reynolds number for positioning the twin-vortex was found to be around 160, by von Karman, to flat plate, is his addition to vortex flow theory. He has published a large number of research articles in many reputed international journals. He is a Fellow of many professional societies including the Royal Aeronautical Society. Rathakrishnan serves as the Editor-in-Chief of the International Review of Aerospace Engineering (IREASE) and International Review of Mechanical Engineering (IREME) journals. He has authored the following books: Gas Dynamics, 8th ed. (PHI Learning, New Delhi, 2026); Fundamentals of Engineering Thermodynamics, 2nd ed. (PHI Learning, New Delhi, 2005); Fluid Mechanics: An Introduction, 4th ed. (PHI Learning, New Delhi, 2021); Gas Tables, 3rd ed. (Universities Press, Hyderabad, India, 2012); Theory of Compressible Flows (Maruzen Co., Ltd. Tokyo, Japan, 2008); Gas Dynamics Work Book, 2nd ed. (Praise Worthy Prize, Napoli, Italy, 2013); Theoretical Aerodynamics (John Wiley, New Jersey, USA, 2013); High Enthalpy Gas Dynamics (John Wiley & Sons Inc., 2015); Dynamique Des Gaz (Praise Worthy Prize, Napoli, Italy, 2015); Helicopter Aerodynamics (PHI Learning, New Delhi, 2019); Applied Gas Dynamics 2nd ed. (John Wiley & Sons Inc., 2019); Introduction to Aerospace Engineering - Basic Principles of Flight (John Wiley, New Jersey, USA, 2021); Encyclopedia of Fluid Mechanics (CRC Press, Taylor & Francis Group, Boca Raton, Florida, USA, 2022); Fluid and Thermal Dynamics Answer Bank for Engineers: The Concise Guide with Formulas and Principles for Students and Professionals (Brown Walker Press, FL, USA, 2023); Mind Power: The Sixth Sense (Routledge, Taylor & Francis Group, Boca Raton, Florida, USA, 2023); Hypersonic Slender Body Aerodynamics (John Wiley, New Jersey, USA, 2025); Elements of Heat Transfer, 2nd ed. (CRC Press, Taylor & Francis Group, Boca Raton, Florida, USA, 2026); and Power of Nature (Routledge, Taylor & Francis, UK, 2026).

Ethirajan Rathakrishnan 是印度坎普爾 Indian Institute of Technology 的航空太空工程學教授。他因在高速噴流領域的研究而享有國際知名度。噴流被動控制的極限稱為 Rathakrishnan Limit，是他對噴流研究領域的貢獻；而呼吸式鈍頭（breathing blunt nose，BBN）概念則是他對高超音速飛行減阻研究的貢獻。這個概念能同時降低頭部的正壓，並提高底部的低壓。

von Karman 曾發現，對於圓柱幾何形狀，定位雙渦（twin-vortex）的 Reynolds number 上限約為 160；Rathakrishnan 將幾何形狀改為平板，使雙渦 Reynolds number 的定位值提高至約 5000，這是他對渦流理論的拓展。他在許多知名國際期刊上發表了大量研究論文。他是包括 Royal Aeronautical Society 在內之多個專業學會的 Fellow。Rathakrishnan 擔任 International Review of Aerospace Engineering（IREASE）與 International Review of Mechanical Engineering（IREME）期刊的總編輯。

他著有以下書籍：Gas Dynamics，第 8 版（PHI Learning，印度新德里，2026）；Fundamentals of Engineering Thermodynamics，第 2 版（PHI Learning，印度新德里，2005）；Fluid Mechanics: An Introduction，第 4 版（PHI Learning，印度新德里，2021）；Gas Tables，第 3 版（Universities Press，印度海得拉巴，2012）；Theory of Compressible Flows（Maruzen Co., Ltd.，日本東京，2008）；Gas Dynamics Work Book，第 2 版（Praise Worthy Prize，義大利那不勒斯，2013）；Theoretical Aerodynamics（John Wiley，美國紐澤西州，2013）；High Enthalpy Gas Dynamics（John Wiley & Sons Inc.，2015）；Dynamique Des Gaz（Praise Worthy Prize，義大利那不勒斯，2015）；Helicopter Aerodynamics（PHI Learning，印度新德里，2019）；Applied Gas Dynamics，第 2 版（John Wiley & Sons Inc.，2019）；Introduction to Aerospace Engineering - Basic Principles of Flight（John Wiley，美國紐澤西州，2021）；Encyclopedia of Fluid Mechanics（CRC Press，Taylor & Francis Group，美國佛羅里達州博卡拉頓，2022）；Fluid and Thermal Dynamics Answer Bank for Engineers: The Concise Guide with Formulas and Principles for Students and Professionals（Brown Walker Press，美國佛羅里達州，2023）；Mind Power: The Sixth Sense（Routledge，Taylor & Francis Group，美國佛羅里達州博卡拉頓，2023）；Hypersonic Slender Body Aerodynamics（John Wiley，美國紐澤西州，2025）；Elements of Heat Transfer，第 2 版（CRC Press，Taylor & Francis Group，美國佛羅里達州博卡拉頓，2026）；以及 Power of Nature（Routledge，Taylor & Francis，英國，2026）。