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shear rates
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  剪切速率
     For AP4 solutions of concentration 800 and 1000 mg/L,having been sheared at 45℃ and different shear rates 200—1550 s~(-1) in 2 minutes,the viscosity retention is of 30—20%,the viscosity recovery on standing is of 80—130% and the recovery is incomplete(<100%) at lower shear rates;
     浓度800和1000 mg/L的AP4溶液在45℃、不同剪切速率(200~1550 s-1)下剪切2 min后,粘度保留率(30%~20%)和静置时粘度恢复率(80%~130%)相当分散,剪切速率低时粘度恢复率<100%;
短句来源
     Under the conditions of 180 ℃ to 310 ℃ and apparent shear rates from 60s-1 to 1000s-1, the flow behaviors of two kinds of polycarbonates (PC) with different molecular weights and the factors influencing the flow behavior have been studied by means of capillary, rheometer.
     应用毛细管流变仪,在温度为180~310℃,表观剪切速率为60~1000s~(-1)的条件下,考察了两种相对分子质量不同的聚碳酸酯(PC)熔体的流动行为及其影响因素。
短句来源
     On viscosity-shear rate(0.1—1000 s~(-1)) curves of AP4 solutions of concentration ≤CAC,an oscilation region,being more intensive and wider extending for lower concentrated solutions,is observed at low shear rates and followed by pseudoplastic and dilatant flow regions;
     AP4溶液45℃粘度-剪切速率(0.1~1000 s-1)曲线,溶液浓度≤CAC时在低剪切速率下出现振荡,振荡强度和振荡区宽度随溶液浓度降低而增大,之后出现假塑性和胀流性;
短句来源
     Rheological behavior at a wide range of shear rates(10~(-2) s~(-1)~ 5×10~3 s~(-1)) for Poly(vinylidene fluoride)(PVDF) melt was investigated by means of high pressure capillary rheometer and advanced rheological extension system(ARES).
     采用高压毛细管流变仪和先进流变扩展系统相结合的方法研究了PVDF熔体在较宽剪切速率范围(1×10-2s-1~5×103s-1)的流变行为。
短句来源
     With increasing nano CaCO3 content, the apparent viscosity of the melt increased at low shear rates and decreased at higher shear rates.
     实验数据显示,在较低剪切速率下,随纳米CaCO3添加量的增加,体系熔体黏度增加; 在较高剪切速率下,随纳米CaCO3添加量的增加,体系黏度降低;
短句来源
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  剪切率
     Methods Fluctuating blood flow was performed at a alternate shear rate between 300 s-1 and 1000 s-1 .Flowing blood at shear rates of 300 s-1 and 1000 s-1 was control as steady flow.
     方法将血液在剪切率300S-1下流动10秒和在剪切率1000S-1时流动10秒之间交替进行,获得血流波动状态;
短句来源
     The diameter of draft tube(d) was negatively correlated with shear rate. When the draft tube with diameter of 5.5 cm was installed,the shear rates in riser,separator and overall shear rate were 85.5%,82.3% and 80.6%,respectively less as compared with that with diameter of 4.0 cm.
     剪切率与导流筒直径呈负相关,导流筒直径从4.0cm增大到5.5cm,升流区、气液分离区及总体剪切率分别降低85.5%、82.3%、80.6%.
短句来源
     Determination of Lubricant Elastic Shear Modulus under Conditions of High Pressure and High Shear Rates
     高压高剪切率下润滑剂剪切弹性模量的确定
短句来源
     By analizing the oil flow and dividing it radially into bottom laminar zone, transitional zone and turbulent corne, it can be concluded from the measured shear rates that when the flow in pipe is small the shearing in transitional and bottom zones has an infuence on the flowa-bility of additive crude oil, while the shearing from turbulent corne also impacts oil flowability when the flow is greater.
     分析管道内加剂原油的流动情况,将流体沿管道径向分为近壁底层区、过渡区和紊流核心区,分别测定各区内流体的剪切率,指出当管输量较低时,主要是过渡区和近壁底层区内的管流剪切对加剂原油低温流动性有影响; 输量较高时,紊流核心区的剪切也影响着加剂原油低温流动性。
短句来源
     Results It showed that, when perfusions were performed for 5 minutes, the percentage coverage of platelets in fluctuating flow was more than that at the shear rates of either 300s-1 or 1000 s-1. Moreover, The adhesion images showed a kind of bolus.
     结果血液灌流5分钟后,波动状态下的血小板黏附率比剪切率为300S-1时和1000S-1时明显增高(均P<0.001),黏附血小板的形态成团块状分布。
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  剪变率
     METHODS:Totally 86 whole blood samples were tested under 7 shear rates(0.6 s-1,2 s-1,5 s-1,10 s-1,20 s-1,40 s-1, 100 s-1) from low shear rate to high shear rate, and then from high shear rate to low shear rate. The measuring value of the two processes was compared.
     方法:本实验86例全血样品,在7个剪变率(0.6,2,5,10,20,40,100s-1)下,顺序从低剪变率到高剪变率,再从高剪变率到低剪变率进行检测,对两个过程的测量值进行比较。
短句来源
     MAIN OUTCOME MEASURES:①Major consequence:apparent viscosity under 7 shear rates in two measuring process;
     主要观察指标:①主要结局:两个测量过程7个剪变率下的表观黏度值。
短句来源
  “shear rates”译为未确定词的双语例句
     1. In summer, at shear rates of 1S-1, 3S-1, 5S-1, 10S-1, 30S-1, 60S-1 , whole blood viscosity of hoof deformities were higher than those of normal hoof in dairy cattle (P<0. 05).
     1、夏季时,1S~(-1)、3S~(-1)、5S~(-1)、10S~(-1)、30S~(-1)、60S~(-1)切变率下,变形蹄奶牛全血粘度高于正常蹄奶牛(P<0.05)。
短句来源
     2. In winter, at shear rates of 5S-1, 10S-1, 30S-1, 200S-1, whole blood viscosity of hoof deformities in dairy cattle were higher(P<0. 05).
     2、冬季时,5S~(-1)、10S~(-1)、30S~(-1)、200S~(-1)切变率下,变形蹄奶牛全血粘度高于正常蹄奶牛(P<0.05)。
短句来源
     In the summer, at shear rates of 1S-1、3S-1、5S-1、10S-1、30S-1、60S -1, whole blood viscosity of hoof deformities cows were higher than that of normal hoof cows (P<0. 05);
     夏季时,1S-1、3S-1、5S-1、10S-1、30S-1、60S-1切变率下,变形蹄奶牛全血粘度高于正常蹄奶牛,有显著差异(P<0.05)。
短句来源
     In the winter, at shear rates of 5S-1、10S-1、30S-1、200S-1, whole blood viscosity of hoof deformities cows were higher than that of normal hoof cows (P<0. 05);
     冬季时,5S-1、10S-1、30S-1、200S-1切变率下,变形蹄奶牛全血粘度高于正常蹄奶牛(P<0.05)。
短句来源
     Results: The within-run cv is 0.037,0.029,0.026 and the between-day cv is 0.065,0.072,0.064 respectively under three shear rates at 6s[-1] .
     结果:在 6、46、200s-1三个切变率 的批内变异系数(CV)分另0.037、0.029、0.026。
短句来源
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  shear rates
The two critical velocities increase as the interaction parameter increases, but they almost remain constant at different shear rates.
      
At high shear rates, a discontinuity appears in the system; the effect depends on the age of initial sols.
      
The experiments performed made it possible to estimate the behavior of modified bitumens at low shear rates corresponding to the extreme conditions of their use.
      
The behavior of these structured nanodisperse systems in the range of extra low shear rates (10-6-10-3 s-1) is studied in detail.
      
In this range of shear rates, the effect of an increase in the rise of effective viscosity with increasing shear stress is revealed for concentrated Aerosil suspensions for the first time.
      
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The effect of shear rate on the viscosity of polymethylmethacrylate in benzene was studied at 25℃ by means of an Ubbelohde dilution viscometer under external hydrostatic pressure. Four fractionated and one unfractionated samples having molecular weights ranging from 4×10~5-5×10~6 were used for measurement. The maximum shear rate at the capillary wall varied in the range 500-8000 sec~(-1). We treated our experimental data by a power law rheological function, from which the polymer solutions show non-...

The effect of shear rate on the viscosity of polymethylmethacrylate in benzene was studied at 25℃ by means of an Ubbelohde dilution viscometer under external hydrostatic pressure. Four fractionated and one unfractionated samples having molecular weights ranging from 4×10~5-5×10~6 were used for measurement. The maximum shear rate at the capillary wall varied in the range 500-8000 sec~(-1). We treated our experimental data by a power law rheological function, from which the polymer solutions show non- Newtonian behavior, except one sample having lowest molecular weight (M=4×10~5). Flow curves were also deduced directly from the efflux times according to the theory of Weisenberg. For the non-Newtonian polymer solution, the relative viscosity η_r~t is defined as the ratio of the maximum shear rate D_R of the Newtonian solvent to that of the non-Newtonian solution under the same maximum shear stress S_R. The values of η_r~t so obtained show that the extrapolation of ln η_r~t or other functions of η_r~t toward D_R→0 is not practical, because the data deviate more from the linear extrapolation when D_R gets smaller. Two definitions of intrinsic viscosity for the non-Newtonian polymer solution were considered: (1) For a given value of D_R, (?); (2) for a given value of (?). These two definitions become identical for a Newtonian solution. Our experimental data show that, at given D_R, lnη_r~l/C plots are linear, while (η_r~l-1)/C plots are curved; at given S_R, both (lnη_r~l /C)-C and ((η_r~l-1)/C)-C plots are linear and give the same intercept on extrapolation to zero concentration. The values of [η]_D and [η]_s decrease with increasing D_R or S_R, and the change is more pronounced at low values of D_R or S_R, so that neither the extrapolation of [η]_D toward D_R→0 nor that of [η]_s toward S_R→0 is practical. In such cases, we propose the use of [η]_D at D_R=3000 sec~(-1) or [η]s at S_R = 25 dyne/cm~2 for the viscometric molecular weight determination of the polymer.

作者用毛細管粘度計,在外加水柱壓力下,測定了聚甲基丙烯酸甲酯的四個經分級的試樣(M=4×10~5-5×10~6)和一個未經分級的試樣(M=5×10~6)在25°時苯溶液粘度的切變速度依賴性。在毛細管管壁的切變速度D_R,變化在500-8000秒~(-1) 的範圍內。對實驗數據首先試用了冪函數形式的流變函數來處理,除M=4×10~5的一個試樣外,溶液粘度都有切變速度依賴性。作者也依照Weisenberg的方法,從實驗數據作出了流變曲線。同時把非Newton溶液對Newton溶劑的相對粘度(η_r)′(在毛細管管壁切變應力S_R下)下定義為:(η_r)′=D_R(溶劑)/D_R(溶液)這樣得到的(η_r)′,除M=1.5×10~(-6)的一個試樣外,In(η_r)′可向D_R→0作線性外推外。對其他數據來說,這樣的外推都是不可能的,因為在D_R值愈小時,離線性的偏差愈大。有切變速度依賴性的高分子溶液,可以有二種方式來給特性粘數下定義:(1)在給定D_R值時,(?);(2) 在給定S_R值時,[η]_S=。祇有Newton液體,以這二種不同方式定義的特性粘數是等值的。作者得到的實驗數據在給定D_R值時,In(η_r...

作者用毛細管粘度計,在外加水柱壓力下,測定了聚甲基丙烯酸甲酯的四個經分級的試樣(M=4×10~5-5×10~6)和一個未經分級的試樣(M=5×10~6)在25°時苯溶液粘度的切變速度依賴性。在毛細管管壁的切變速度D_R,變化在500-8000秒~(-1) 的範圍內。對實驗數據首先試用了冪函數形式的流變函數來處理,除M=4×10~5的一個試樣外,溶液粘度都有切變速度依賴性。作者也依照Weisenberg的方法,從實驗數據作出了流變曲線。同時把非Newton溶液對Newton溶劑的相對粘度(η_r)′(在毛細管管壁切變應力S_R下)下定義為:(η_r)′=D_R(溶劑)/D_R(溶液)這樣得到的(η_r)′,除M=1.5×10~(-6)的一個試樣外,In(η_r)′可向D_R→0作線性外推外。對其他數據來說,這樣的外推都是不可能的,因為在D_R值愈小時,離線性的偏差愈大。有切變速度依賴性的高分子溶液,可以有二種方式來給特性粘數下定義:(1)在給定D_R值時,(?);(2) 在給定S_R值時,[η]_S=。祇有Newton液體,以這二種不同方式定義的特性粘數是等值的。作者得到的實驗數據在給定D_R值時,In(η_r)′/C對C的圖,線性是好的;但((η_r)′-1)/C對C的圖是彎曲的。在給定S_R值時,ln(η_r)′/C或((η_r)′-1)/C對C的圖都呈線性, 而且其外推值相同。[η]_D和[η]_S都隨D_R或S_R的增加而減少,向D_R→0或S_R→0的外推,都是不可能的;因為在低D_R或S_R值時,變化更大。根據這些結果,我們建議用D_R=3000秒~(-1)時的[η]_(D=3000) 或用S_R=25達因/厘米~2時的[η]_(S=25)來做粘度平均分子量的量度。在應用[η]_(S=25) 的數據時,假若用t_r=t/t_0。來代替(η_r)′(t_r與(η_r)′在溶液的非Newton程度不大時,相差很小),那末祇要在一個給定外加壓力下測定,可以達到快捷的要求。

An investigation of the rheological relationships between shear stress shear rate apparent bulk viscosity temperature was carried out by examining the viscous flow of slightly milled native Hevea rubber (i) The Eisenschitz's equation for non-Newtonian flow has been verified by the experiments on the dependence of shear rate on shear stress. By this equation, the apparent viscosity can be referred to the Newtonian viscosity η_0 (at σ=0). The parameter (G_i=3.30×10~5 dynes/cm~2), interpreted as an internal...

An investigation of the rheological relationships between shear stress shear rate apparent bulk viscosity temperature was carried out by examining the viscous flow of slightly milled native Hevea rubber (i) The Eisenschitz's equation for non-Newtonian flow has been verified by the experiments on the dependence of shear rate on shear stress. By this equation, the apparent viscosity can be referred to the Newtonian viscosity η_0 (at σ=0). The parameter (G_i=3.30×10~5 dynes/cm~2), interpreted as an internal modulus of rigidity, was found to be practically independent of temperature in the range of 50-90℃, thus agreeing with the results by treating Saunder and Treloar's data. (ii) For the shear rate dependence of apparent viscosity, when the number of Khun segments per unit volume was taken into account for the calculation of retardation time τ_1=2.84η_0 [J_e]_∞, the Debye-Bueche's equation was found to be able to fit into our data at moderate low shear rates. The values of steady-state elastic compliance [J_e]_∞ were determined by elastic-recovery experiments. Furthermore, the internal shear modulus Gi could be thus calculated by combining the Eisenschitz's equation with the Debye-Bueche's one. (iii) From the experiments on the temperature dependence of viscous flow under various stresses, the apparent activation energy ΔE_η was found to be 12.7 kcal/mole; and therefrom, by estimation, the unit of flow-the Eyring segment would be 30 carbon atoms long. All determinations of the flow rate under constant stress were carried out in a Hppler parallel-plate plastometer, used as a viscoelasticity-rheometer according to the theory developed by Dienes.

1.本實驗採用了Hoeppler平行板塑性計,按照定應力壓縮形變法的理論,在中温時對國產天然橡膠的本體粘性流動進行了流變學研究。 2.在30-90°與250-1500克/厘米~2的荷重範圍內,測定了貌似本體粘度η_a,內切模數G_i與貌似活化能ΔE_η。所測得的G_i=3.30×10~5達因/厘米~2與ΔE_η=12.7千卡/克分子,在一定温度範圍(50-90°)內爲不依賴於温度的常數。對所測天然橡膠估計所得的粘流鰱段長約30個碳原子。 3.從粘性流動的切變速率dγ/dt依賴於切應力σ的關係中,獲得了Eisenschitz早已衍導出的,但迄未在高聚物的本體粘性流動中獲得例證时非牛頓流動流公式。該式復以Saunder及Treloar的數據重加處理而證實之。 4.從切變速率對貌似本體粘度的影響上,檢驗了Debye-Bueche的理論式。現改用單位體積內彈性鍵段計算推遲時間,τ_1=2.84η_0·[J_e]∞,其中穩態彈性柔數[J_e]∞。係由彈性同復實驗測得。經如此處理後,該式在較低切變速率時筒能與實驗結果相符。 5.若以Eisenschitz式與Debye-Bueche式相結合,則亦可計得內切模數G_i,並藉...

1.本實驗採用了Hoeppler平行板塑性計,按照定應力壓縮形變法的理論,在中温時對國產天然橡膠的本體粘性流動進行了流變學研究。 2.在30-90°與250-1500克/厘米~2的荷重範圍內,測定了貌似本體粘度η_a,內切模數G_i與貌似活化能ΔE_η。所測得的G_i=3.30×10~5達因/厘米~2與ΔE_η=12.7千卡/克分子,在一定温度範圍(50-90°)內爲不依賴於温度的常數。對所測天然橡膠估計所得的粘流鰱段長約30個碳原子。 3.從粘性流動的切變速率dγ/dt依賴於切應力σ的關係中,獲得了Eisenschitz早已衍導出的,但迄未在高聚物的本體粘性流動中獲得例證时非牛頓流動流公式。該式復以Saunder及Treloar的數據重加處理而證實之。 4.從切變速率對貌似本體粘度的影響上,檢驗了Debye-Bueche的理論式。現改用單位體積內彈性鍵段計算推遲時間,τ_1=2.84η_0·[J_e]∞,其中穩態彈性柔數[J_e]∞。係由彈性同復實驗測得。經如此處理後,該式在較低切變速率時筒能與實驗結果相符。 5.若以Eisenschitz式與Debye-Bueche式相結合,則亦可計得內切模數G_i,並藉知貌似本體粘度隨切變速率增高而降低的現象,乃係由於發生內切應變γ_i=σ/G_i之故。

The viscosities of five fractionated polymethylmethacrylate samples in benzene have beendetermined in an Ubbelohde dilution viscometer under various external hydrostatic pressures.With the weight average molecular weights obtained from light scattering,the following[η]-Mrelationships are obtained for molecular weights ranging from 0.2 to 4.5×10~6(25℃):under no external pressure [η]=3.80×10~(-3) M~(0.79) ml/gwhen S_R=55 dyne/cm~2 [η]=12.6×10~(-3) M~(0.70)when D_R=5000 sec~(-1) [η]=8.37×10~(-3) M~(0.73)It is pointed...

The viscosities of five fractionated polymethylmethacrylate samples in benzene have beendetermined in an Ubbelohde dilution viscometer under various external hydrostatic pressures.With the weight average molecular weights obtained from light scattering,the following[η]-Mrelationships are obtained for molecular weights ranging from 0.2 to 4.5×10~6(25℃):under no external pressure [η]=3.80×10~(-3) M~(0.79) ml/gwhen S_R=55 dyne/cm~2 [η]=12.6×10~(-3) M~(0.70)when D_R=5000 sec~(-1) [η]=8.37×10~(-3) M~(0.73)It is pointed out that the shear rate dependence of α has its significance when the theory of intrin-sic viscosity is being applied to the experimental data.The slope constants k' and β of the viscositydata show only slight dependence on S_R or D_R,in disagreement with the results of otherinvestigators.The apparatus used for light scattering measurements is described and the valuesof A_2 and <~2>_z obtained for the polymethylmethacrylate fractions in acetone are given.

在不同外加水压下作者等用毛细管粘度计测定了聚甲基丙烯酸甲酯五个分级试样的苯溶液粘度,并用光散射法在丙酮溶液中测定了重均分子量,得到下列特性粘数、分子量关系式(25°)。不加外压时:[η]=3.80×10~(-3)M~(0.79)毫升/克S_R=55达因/厘米~2:[η]_s=12.6×10~(-3)M~(0.70)D_R=5000秒~(-1):[η]_D=8.37×10~(-3)M~(0.73) 适用于分子量范围0.2—4.5×10~6。并指出用实验数据验证性粘数理论时,α值的切变速度依赖性有重要的影响。粘度数据中斜度系数 k′或β值,无论对 S_R 或 D_R 都没有显著的影响,与前人的结果有不同。对光散射测定所用仪器加以叙述并从光散射数据得到了试样的 A_2和<~2>_z 的数值。

 
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