著者

山根 隆志 丸山 修 西田 正浩 加藤 孝久 筒井 達夫 軸屋 智昭 山海 嘉之 大久保 剛 佐野 岳志 宮本 祐介

出版者

一般社団法人日本機械学会

雑誌

バイオフロンティア講演会講演論文集 (ISSN:13482939)

巻号頁・発行日

vol.2003, no.14, pp.39-40, 2003-09-17

著者

片平 和俊 鈴木 秀人 岡田 昌巳 友田 陽 岩野 利彦

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.64, no.622, pp.1475-1480, 1998-06-25

被引用文献数

7 1

---

To improve the fatigue reliability for SMn 435 steel by an environmentally sound surface modification, the influence of the modification on fracture mechanism was studied experimentally. The fatigue properties of SMn 435 are found to be obviously improved by gas soft-nitriding, so that they can no longer be estimated by using a concept of "S-N Globe"which has successfully been applied to many surface-treated materials. The detailed observations have revealed that fatigue crack initiation in a gas soft-nitrided SMn 435 specimen occurs in a hardened region near surface not in a subsurface region with virgin microstructure. The crack initiation is attributable to cyclic plastic deformation in the subsurface region. Such a crack initiation mechanism is different from that previously observed in other surface treated materials, explaining the reason why the S-N Globe concept can not be applied to the present case.

著者

塩谷 隆二 金山 寛 淀 薫

出版者

一般社団法人日本機械学会

雑誌

日本機械学会九州支部講演論文集

巻号頁・発行日

vol.2000, no.53, pp.103-104, 2000-03-13

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For 3-dimensional large scale finite element analysis, automating of mesh generation is one of important process for automating of whole finite element analysis system. But for 3-dimensional automatic mesh gemeration method with internal boundary surface has not been developed unlike for 2-dimensional one. In order to solve this issue, in this study we developed an automatic generation mesh system with internal boundary surface using 3-dimensional Delaunay triangulation.

著者

高辻 正基 小国 研作

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.86, no.770, pp.109-113, 1983-01-05

被引用文献数

1

著者

辻本 聡一郎 神田 誠 国友 孟

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.48, no.427, pp.545-553, 1982-03-29

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低温機器の構造材料として重要なA1およびA1合金の垂直反射率を室温では0.4μmから20μmの波長域で,室温から16Kまでは2.6μmから20μmで測定し,実測値を説明できるモデルの検討を行った.従来の異常表皮効果理論ではその温度依存性を説明することができず,表面の微小凹凸,格子欠陥による伝導電子の付加的な散乱を考慮して求めた緩和時間をDrudeの式に導入する新しいモデルにより,うまく説明できることがわかった.

著者

牧野 俊郎 若林 英信

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.769, pp.1406-1411, 2010-09-25

被引用文献数

2

---

This paper discusses the Kirchhoff's law on thermal radiation. The logic of derivation of the law is reconsidered, first. Then, spectra of normal emittance ε_N and normal incidence hemispherical reflectance R_<NH> are measured on surfaces whose microstructure changes in a non-equilibrium experimental system to examine the validity of the complementary relation between ε_N and R_<NH>, which is the suggestion of the Kirchhoff's law. As the results of the examination, it is illustrated experimentally on a variety of surfaces that the complementary relation is valid within an experimental uncertainty. Provided this conclusion is admitted, the followings are suggested. If a surface is designed so that it does not reflect a narrow spectral region of radiation to any direction and reflects the other spectral regions of radiation much over the hemisphere, then the surface can be a new spectrally-functional emitter of radiation. It is also suggested that thermal radiation emitted at a surface is considered as the emission of plane waves at the surface rather than as the emission of spherical waves by electric dipoles.

著者

中園 敦之 坂梨 暢泰

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.59, no.559, pp.963-966, 1993-03-25

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Infrared emissivity of cold rolled steel sheets around 100℃ is affected with its metal composition, surface roughness, measuring wave lenghth, etc. On these elements, the effect of surface roughness has not yet been fully clarified because of the reason of itsp said small effect on measured emissivity. In this paper, the effect of surface roughness described as surface inclinationan for measuring wave length on infrared emissivity has been studied and the variance level is shown. Infrared emissivity for 2, 5, 10 μm wave length and surface roughness measuring data has been obtained for 7 pieces of cold rolled steel sheets. Modified Paulmier's erissivity model for surface roughness variance by adding wave length term has been obtained and comparison of the model with the measurement values is shown here.

著者

吉田 篤正 国友 孟

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.50, no.453, pp.1444-1450, 1984-05-24

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In order to make clear the thermal structure of the atmosphere in urban area, one-dimensional numerical simulation is performed. Paticular attention is paid to the effects of condition of the earth surface, aerosol and artificial heat release. The results indicate that the temperature in urban area is generally higher than that in rural one and that the inversion layer near the earth surface in the urban area disappears at night in the winter season due to surface roughness and artificial heat.The considerable difference is formed in temperature in rural and urban areas for several hours before and after sunset. Aerosol has much effect in the daytime and the maximum effect of the diameter is found in the case when the diameter nearly equal to the wavelength of the visible light.

著者

竹森 利和 中島 健 庄司 祐子

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.61, no.584, pp.1513-1520, 1995-04-25

被引用文献数

22 1

---

We have developed a fundamental model of the human thermal system (AVA model) for the prediction of thermal comfort. The distinguishing feature of this model is a more precise description of heat transfer by blood flow (i. e., it includes arteriovenous anastomoses (AVA) of the extremities and a dual vascular network) than conventional models of human thermal systems. The following results were obtained : (1) The experimental verification under three different steady thermal conditions (22℃, 28℃ and 34℃) and an unsteady thermal condition (28. 1℃+ 47. 1℃+ 28. 3℃) suggests that the AVA model can simulate body temperature profiles well. (2) The visualized results of the model predictions demonstrate that the calculated tissue temperature and blood temperature distributions are physiologically plausible.

著者

石原 勲 村上 巧 南 秀一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.614, pp.3370-3374, 1997-10-25

被引用文献数

1

---

Optical interferometers, such as the Mach-Zehnder interferometer, have often been used to measure the temperature of transparent fluids. In this paper, we utilize a Moire interferometer in which a conventional interferometer is combined with the Moire technique. By applying a fringe scanning technique to this Moire interferometer, a new fringe analytical system is obtained and the fringe analysis is automated with the aid of a personal computer. The temperature field of the air around a vertical heated plate under natural convection is measured and compared with the theoretical solution. The temperature measured using this system is in good agreement with the theoretical one. It is verified that this optical system is applicable for measuring the temperature of transparent fluids.

著者

伊與田 浩志 西村 伸也 野邑 奉弘

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.66, no.650, pp.2681-2688, 2000-10-25

被引用文献数

7 1

---

For clarification of the mechanism of heat and mass transfer in the early stages of superheated steam drying which accompanies condensation and evaporation, we had done both the experiments and the simple calculation for a semiinfinite heat transfer model. And we found the existence of "reverse point" at which neither condensation nor evaporation occurs in the early stage of superheated steam drying. In this report, in order to investigate the physical reason of the reverse point and its change according to the shapes of heat transfer model, similar analytical and experimental methods were applied for both a spherical and a large slab heat transfer models. As a result, restoration time changes in the range of 3.2〜10times the reverse time with changes of scale, heat transfer rate and initial temperature of the heat transfer models.

著者

越後 亮三

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.67, no.549, 1964-10

著者

越後 亮三 西脇 仁一 平田 賢

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.32, no.243, pp.1718-1725, 1966-11-25

著者

越後 亮三

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.34, no.257, pp.108-115, 1968-01-25

著者

国友 孟 大隅 正人 丹原 允彦 増崎 博久

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.41, no.349, pp.2673-2680, 1975-09-25

著者

福田 研二 越後 亮三 長谷川 修

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.38, no.315, pp.2873-2882, 1972-11-25

被引用文献数

2

著者

国文 孟 二井内 親兵衛

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.38, no.312, pp.2109-2118, 1972-08-25

著者

岡本 芳三

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.31, no.226, pp.958-963, 1965-06-25

著者

山口 義幸 浅古 豊 Faghri Mohammad

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.610, pp.2119-2126, 1997-06-25

被引用文献数

2

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Combined heat transfer characteristics are obtained numerically for three-dimensional natural convection and thermal radiation in a long and wide vertical porous layer with a hexagonal honeycemb core. The porous layer is assumed to be both homogeneous and isotropic. The pure Darcy law for the fluid flow and Rosseland's approximation for the radiation are employed. The numerical methodology is based on an algebraic coordinate transformation technique and the transformed governing equations are solved using the SIMPLE algorithm. The effect of radiation on the heat transfer characteristics is investigated in a wide range of radiation numbers and emprerature ratios, for two Darcy-Rayleigh number values (Ra^*=100,1000), and for a fixed aspect ratio of H/L=1. The results are presented in the form of combined and convection heat transfer coefficients, and are compared with the corresponding values for pure natural convection.

著者

山田 純 一宮 浩一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.616, pp.4036-4042, 1997-12-25

被引用文献数

1

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This study deals with gas sensible heat-radiative energy exchange in fibrous media used for a system of energy recovery from high temperature exhaust gas from an industrial plant. The effects of fiber diameter, orientation, medium thickness and the fiber radiative characteristics on the recovered energy have been numerically investigated. The results show that, if the heat transfer coefficients between the fibers and the gas are assumed to be those of circular cylinders in a cross-flow, the gas sensible heat can be exchanged to radiative energy and recovered by use of a medium with fibers less than 500μm in diameter under the present calculation conditions. The results also show the value of the absorption index of the fiber material required for efficient energy recovery.