巻号一覧
5 巻, 4 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
-
長阪 匡介, 矢田 哲史, 目崎 令司1993 年 5 巻 4 号 p. 230-235
発行日: 1993/04/20
公開日: 2009/11/18
ジャーナル フリーPDF形式でダウンロード (897K) -
中野 祥生, 梶原 稔尚, 船津 和守1993 年 5 巻 4 号 p. 255-260
発行日: 1993/04/20
公開日: 2009/11/18
ジャーナル フリーThe velocity and temperature fields in non-isothermal flow of highly-viscous non-Newtonian Fluid through a planar abrupt contraction were calculated by the finite element method. It was found that the temperature rose in the slit region because of viscous heat generation and its value at x/H=80 (x: distance in the flow direction from the entrance of slit, H: half of slit thickness) was locally 30-40°C at a wall shear rate of γw=1262s-1. Since the heat conduction of fluid in the thickness direction was very small in comparison with the heat convection in the flow direction, the temperature rise near the wall increased in the slit but the temperature near the middle of slit hardly rose. The temperature profiles over the cross section perpendicular to the flow direction had a maximum near the wall and these profiles caused a difference in velocity fields between the temperature-dependent and temperature-independent viscosity flows. When the inlet temperature of the fluid was lower than the wall temperature, the maximum temperature and its position over the cross-section at x/H=80 did not change with the inlet temperature, but the velocity field did.抄録全体を表示PDF形式でダウンロード (750K) -
宮本 玲, 松井 裕次, 宇田 徹, 橋本 寿正1993 年 5 巻 4 号 p. 261-266
発行日: 1993/04/20
公開日: 2009/11/18
ジャーナル フリーThe higher-order structures of skin and core layers in an injection-molded polypropylene were studied by means of thermal diffusivity measurements. Test pieces of 50-150μm thick were cut from the injection-molded plates in three different directions by use of a diamond cutter and microtome; flow direction (MD), transverse direction (TD), and thickness direction (ND). The thermal diffusivities of the test pieces were measured by a simple non-steady method using AC Joule heating, which had been developed in our laboratory. The measured thermal diffusivity and its anisotropy were correlated with the higher-order structure revealed by means of polarizing microscopy, differential scanning calorimetry and wide angle X-ray diffraction. The results clearly show that the thermal diffusivity is isotropic in the core layer while that in the skin layer is anisotropic.抄録全体を表示PDF形式でダウンロード (1500K) -
第1報 ゲルプレスおよびプレスフィルムの同時二軸延伸による結晶各回折面の配向挙動と力学的性質大元 義夫, 丹羽 貴裕, 橋詰 慈洋, 日比 貞雄1993 年 5 巻 4 号 p. 267-277
発行日: 1993/04/20
公開日: 2009/11/18
ジャーナル フリーHomo polyethylene and polyethylene-polypropylene blends were produced by gelation/crystallization from semidilute solutions using ultrahigh molecular weight polyethylene (UHMWPE) (2.0×106) and low molecular weight high crystallinity polypropylene (it-PP) (4×105). Homo it-PP film was produced by compression molding. Blend composition chosen were 75/25, 50/50, and 25/75. Homo PE and blend films were pressed using a molding machine in order to gain uniform thickness gelation films. Biaxial films, typically 2×2 and 3×3 times (for it-PP, 3×3 and 5×5 times) the original dimensions, were prepared at 130∼160°C in a biaxial stretcher. WAXD photographs show that lamellar structure transforms to fibrillar texture during biaxial stretching. The preferential orientations of the crystals were characterized by WAXD photographs. Mechanical studies suggest that tensile modulus and strength appear uniform. In comparison with undeformed film, significant improvement in the film plane was seen in the biaxially stretched film.抄録全体を表示PDF形式でダウンロード (4204K)
- |<
- <
- 1
- >
- >|