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Hideo Mori Last modified date:2023.09.29

Associate Professor / Fluids Engineering
Department of Mechanical Engineering
Faculty of Engineering

Graduate School
Undergraduate School

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Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Fluid Engineering, Measurment Engineering
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
Hideo Mori (fluids) performs the research of optical imaging measurement techniques for gas flows such as pressure/temperature sensitive paints (PSP/TSP). These techniques enable imaging of two-dimensional pressure and temperature distributions on solid surfaces noninvasively. Currently he applies optical imaging measurement techniques such as PSP/TSP and particle image velocimetry (PIV) to measurement of internal flow fields of turbomachines. Turbomachinery flows interacting with rotor blades are very complicated and experimental analysis of the flows is highly challenging. The advantage of the noninvasive imaging measurement techniques is very powerful for experimental analysis of turbomachinery flows.
To improve the optical imaging measurement technology it is very important to collaborate with chemical engineers acquainted with molecular sensors. He participates in the German-Japanese Joint Seminar “Molecular Imaging Technology for Interdisciplinary Research” for researchers in mechanical and chemical engineering.
As educational activities, he gives classes of gas dynamics, exercise of fluid mechanics, vector analysis, and design of axial fans, as well as research guidance for graduate students and undergraduate students including foreign students, and seminars related to fluid dynamics, turbomachinery, and flow visualization in the laboratory.
Research Interests
  • Fundamental Research of Functional Limitation for Pressure Sensitive Paints
    keyword : Pressure sensitive paint, Nonstationary flow field
  • Development of high-sensitive measurement system of pressure distribution
    keyword : Pressure sensitive coating, Imaging measurement, Fluorescence resonance energy transfer
  • Experimental Analysis of Internal Flows in Turbomachinery Using Optical Measurement Technique
    keyword : Turbo Machinery, Pressure Sensitive Paint, Temperature Sensitive Paint, Particle Image Velocimetry, Complex Flows
  • Application of Oxygen Pressure Measurement Technique using Pressure Sensitive Paints (PSP) to High Knudsen Number Flows
    keyword : Pressure Sensitive Paint, Oxygen Pressure Distribution, Noncontact Measurement, High Knudsen Number Flows
  • Experimental Analysis of Low-density Supersonic Free Jets by Resonantly Enhanced Multiphoton Ionization (REMPI)
    keyword : Resonantly Enhanced Multiphoton Ionization, Rarefied Gas Flows, Laser-aided Analysis, Temperature Nonequilibrium
Academic Activities
1. Application of Phosphorescence Measurement outside Aerospace Field
Toshiaki Kamachi, Hidehiro Ito, Hiroki Nagai, Hideo Mori, Kazumasa Oguri, Hiroshi Kitazato, and Makoto Obata
Journal of the Visualization Society of Japan, Vol. 38, No. 148, pp. 25-31.
2. Bi-luminophore Coatings for Temperature Correction of Pressure-Sensitive Paint Measurement
Kazunori MITSUO, Hideo MORI, Tomohiro KAMEYA
Journal of the Visualization Society of Japan, Vol. 37, No. 147, pp. 182-187.
3. Flow Measurement Techniques Based on Fluorescence/Phosphorescence Lifetime - Lifetime Based PSP/TSP and Molecular Tagging Measurements -
Yu Matsuda, Daisuke Yorita, Hideo Mori and Taro Handa
Journal of the Visualization Society of Japan, Vol. 37, No. 147, pp. 177-181.
4. Intensity-Based PSP and TSP Measurements
Daiju Numata, Hideo Mori, Yu Matsuda and Yoshitaka Sakamura
Journal of the Visualization Society of Japan, Vol. 37, No. 147, pp. 171-176.
5. Application of Pressure Measurement Technique by Pressure Sensitive Paint to Mechanical Engineering.
6. Measurement of Temperature and Density for Highly Rarefied Gas Flows
(Resonantly Enhanced Multiphoton Ionization).
7. Development of Pressure Sensitive Molecular Film by Langmuir-Blodgett method.
8. Hideo Mori, Carl Dankert, and Tomohide Niimi, Resonantly Enhanced Multiphoton Ionization for Analysis of rarefied Supersonic H2 + N2 Flows, DLR-IB, German Aerospace Center, 2001.09.
1. Kil Ju Moon, Hideo Mori, Masato Furukawa, Simultaneous measurement method of pressure and temperature using dual-layer PSP/TSP with lifetime-based method, Measurement Science and Technology, 10.1088/1361-6501/aae408, 29, 12, 2018.10, Recently, the application field of the pressure measurement technique using pressure sensitive paint (PSP) has been expanding. However, the temperature dependence of PSP is a serious obstacle to accurate pressure measurement in low gauge pressure conditions because PSP is an absolute pressure sensor. Therefore, the temperature information of PSP is indispensably required for accurate pressure measurement, especially in low gauge pressure conditions. As a result, both temperature information and pressure information with a function of temperature are required simultaneously to use the PSP in low gauge pressure conditions. Dual-layer PSP/temperature sensitive paint (TSP) (DL-PTSP) is one solution, but simultaneous measurement of pressure and temperature requires two optical filters to separate the luminescence of PSP and TSP, resulting in complex equipment and additional error caused by parallax. To solve the problem, we introduce a lifetime-based method for DL-PTSP that allows simultaneous measurement of pressure and temperature. It is a method which separates each component of luminescence with different lifetimes. Firstly, the DL-PTSP developed in this study was optimized by reducing the luminescence intensity of the PSP with a longer lifetime while maintaining the luminescence intensity of the TSP with a shorter lifetime, considering the lifetime measurement method. Secondly, we have clarified the optimum time conditions of the monolayer TSP and the monolayer PSP by analysing their luminescence decay process, by controlling the irradiation delay of the light source relative to the camera shutter. Thirdly, the sensitivity of the DL-PTSP was examined using conditions optimized for mono-layer TSP and PSP. The luminescence decay of the TSP component shows sufficient temperature dependence, while the pressure dependence is very small. On the other hand, the dependence of the luminescence decay of the PSP component on the temperature and pressure is almost equal to that of the mono-layer PSP. The results confirm the feasibility of the simultaneous measurement of pressure and temperature using DL-PTSP..
2. Pressure sensitive paint (PSP) using poly(TMSP) as a polymer binder has high pressure sensitivity for low gauge pressure conditions observed in low-speed flows, which is important for research and development in mechanical engineering fields. Although the response time of poly(TMSP)-based PSP is of the order of milliseconds, which is slower than fast-response porous-type PSP, it may be useful for the measurement of nonstationary pressure distribution with low pressure amplitude as high as 100 Pa, if the frequency is not higher than the order of 100 Hz. In this study, we have investigated the nonstationary response of poly(TMSP)-based PSP, to evaluate the feasibility of the polymer-based PSP as a measurement tool for nonstationary low-speed flows. We have applied the poly(TMSP)-based PSP to measurement of nonstationary pressure distribution around a circular cylinder in low-speed flow, and compared the amplitude spectra of PSP and that of pressure probe, both of which are obtained by FFT analysis. As a result, it is clarified that the poly(TMSP)-based PSP can detect nonstationary pressure of 90 Hz with the amplitude of 70 Pa. For higher frequency the sensitivity of the poly(TMSP)-based PSP decreases, but the nonstationary pressure of 850 Hz with the amplitude of 310 Pa can be detected. Furthermore we have visualized the distribution of the integrated intensity of the PSP amplitude spectrum around the peak, to visualize the area with large pressure fluctuation on the cylinder..
3. Hideo Mori, Tomohide Niimi, Madoka Hirako and Hiroyuki Uenishi, Pressure sensitive paint suitable to high Knudsen number regime, Measurement Science and Technology, Vol. 17, pp. 1242-1246, 2006.06.
4. Hideo Mori, Tomohide Niimi, Isao Akiyama and Takumi Tsuzuki, Experimental Detection of Rotational Non-Boltzmann Distribution in Supersonic Free Molecular Nitrogen Flows, Physics of Fluids, Vol. 17, No. 117103, 2005.11.
5. Hideo Mori, Tomohide Niimi, Madoka Hirako and Hiroyuki Uenishi, Molecular Number Flux Detection using Oxygen Sensitive Luminophore, Physics of Fluids, Vol. 17, No. 100610, 2005.10.
6. Hideo Mori, Toshihiko Ishida, Yoshinori Aoki, and Tomohide Niimi , A Study on REMPI as a Measurement Technique for Highly Rarefied Gas Flows (Analyses of Experimental REMPI Spectra in Supersonic Free Molecular Flows), JSME International Journal, Series B, Vol. 44, No. 3, pp.388-394, 2001.03.
1. Hideo Mori, Tomohiro Imazeki, Kil Ju Moon, Temperature compensation for measurement of low-speed internal flow fields using fast-response pressure sensitive paint, ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019, 2019.08, Because most fast-response pressure sensitive paints (PSP) suffer from temperature sensitivity, causing large error in pressure measurement when spatial non-uniformity of pressure distribution is large. In this study, the two methods of composite measurement of temperature and pressure by using the segment painting of PSP and TSP, and Dual-layer PSP/TSP (DL-PTSP), are applied to measurement of pressure distribution on inner surface of casing of test axial compressor, by using transparent method. We apply a paintable fast-response PSP composed of PtTFPP and silica nanoparticles and polymer-based TSP composed of Ru-phen and PMMA, with opaque, oxygen permeable overcoat, in order to enhance the luminescence intensity of PSP and TSP and avoid overlaying image of rotors inside the casing. When segmented-painting method of PSP and TSP is applied, pitch-wise symmetry is assumed. Therefore, asymmetric temperature distribution causes error in temperature compensation. On the other hand, DL-PTSP method can be used for asymmetric conditions, but sequential measurement of pressure and temperature may cause error in temperature compensation, when temperature distribution on the surface is nonstationary..
Membership in Academic Society
  • Turbomachinery Society of Japan
  • The Japan Society of Mechanical Engineers
  • The Visualization Society of Japan
  • The Japan Society for Aeronautical and Space Sciences
  • American Institute of Aeronautics and Astronautics
  • American Physical Society
  • Development of Advanced Fluid Measurement Techniques and Application to Low-density Fluids
  • Awards of Japan Society of Mechanical Engineers (paper), "A Study on Fundamental Properties of PSP in Low Pressure Region", 7th April, 2006.
  • Awards of Japan Society of Mechanical Engineers (paper), "A Study on REMPI as a Measurement Technique for Highly Rarefied Gas Flows (Analyses of Experimental REMPI Spectra in Supersonic Free Molecular Flows)", 5th April, 2001.
Educational Activities
Gives lectures and exercises of vector analysis, fluids engineering, and design of axial fans for undergraduate students.
Gives lectures of gas dynamics for graduate students of mechanical engineering course including the global course.
Professional and Outreach Activities
Joined "German-Japanese Seminor on Molecular Imaging Technology for Interdisciplinary Research".