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The hydraulic‐thermal characteristics of 3D pinned heat sink designs have been numerically compared as the first part of a three‐part investigation. Five different pin geometries (circular, square, triangular, strip, and elliptic pins) and an unpinned heat sink with three types of nanofluids (Al2O3–H2O, SiO2–H2O, and CuO–H2O) are considered for laminar forced convection. The range of Reynolds number is from 100 to 1000, and volume fractions vary between 0% and 5%. The finite volume method is employed to solve the Navier–Stokes and energy equations by employing a SIMPLE algorithm for a computational solution. Three parameters are presented—the Nusselt number, the bottom temperature, and the hydrothermal performance of the heat sink with pressure drop data. The findings indicated that the overall hydrothermal performance of elliptic‐pinned (EP) heat sinks produces the most substantial value of 3.10 for pure water. For different nanofluids, the SiO2–water nanofluids with EPs have the most significant hydrothermal performance. Also, this factor is enhanced with an increase in nanofluid concentration up to nearly 3.34 for 5% of SiO2–water. Consequently, applying the elliptic‐pinned heat sinks is recommended with pure water for considering an increase in the pressure drop, with 5% of SiO2–water nanofluids, regardless of an enlargement of pressure drop for heat‐dissipation applications. 相似文献
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Hussein Shaymaa Abed Mohammed Mohanad Adel Mahdi Marwah M. Al Mashhadani Zuhair I. Abood Emad Salaam Zhao Xiaoguang 《SILICON》2023,15(1):285-291
Silicon - The potential of CNT(10, 0) and SiNT(7, 0) and their metal doped CNT(10, 0) and SiNT(7, 0) to adsorb the NH2, OH and Ethyl eugenols are examined. The antioxidant potential of NH2-, OH-... 相似文献
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Kadhim Mustafa M. Rheima Ahmed Mahdi Shadhar Mohanad Hatem Abdulnabi Shuaib M. Saleh Zuhra Muter Al Mashhadani Zuhair I. Najm Zainab Mohsen Sarkar A. 《SILICON》2023,15(1):417-424
Silicon - A theoretical research study was conducted into the possibility of using a two-dimensional graphene-like material silicon carbide nano-sheet (2D-SiCNS) as an anode in rechargeable Ca-ion... 相似文献
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Mohanad?Bashari Mehdi?Nikoo Zhengyu?JinEmail author Yuxiang?Bai Xueming?Xu Na?Yang 《European Food Research and Technology》2012,234(4):639-648
In our current research work, we investigated the effects of molecular weight (M
w) and the concentration of dextran presence during cane sugar manufacturing on the rheological and glass transition properties
of supersaturated sucrose solution. Three dextrans of various M
w, namely 100,000 g/mol (T
100), 500,000 g/mol (T
500) and 2,000,000 g/mol (T
2000), were admixed in concentrations between 1,000 and 10,000 ppm with 65 and 75% w/w sucrose solution. The results indicated
that both the apparent viscosity and dynamic modulus increased with an increase in dextran concentrations and they demonstrated
strong dependence on its M
w. Glass transition temperature (T
g) of the samples was measured by differential scanning calorimetry, and their dependence on dextran M
w and concentration was analyzed by the Fox and expanded Gordon–Taylor mathematical models. It was found that the higher the
M
w and concentration of the dextran, the greater the increase in T
g. The expanded Gordon–Taylor equation has proved useful in predicting the T
g of the sucrose solution in the presence of polymer. 相似文献
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Mohanad Alabdullah Ashwin Polishetty Junior Nomani Guy Littlefair 《Machining Science and Technology》2019,23(2):171-217
This work presents machinability assessment of AL-6XN super austenitic stainless steel alloy. Cutting forces, surface roughness, work hardening tendency and tool wear were analyzed. The assessment was conducted based on a comparison between the AL-6XN alloy and the well-known alloy in the machining field AISI 316. Finite element analysis (FEA) study was also conducted and used in this assessment. Experimental results showed maximum increase of 70% and 57% in the feed and normal forces of the AL-6XN alloy, respectively. Maximum increase in the work hardening tendency of 59% was recorded for the AL-6XN alloy while only 29% was recorded for the 316 alloy. The roughness analysis recorded an increase of 186% for the AL-6XN alloy compared to the 316 alloy. Tool wear analysis revealed the build-up edge formation, severe chipping, flank and crater wear (CW) during cutting AL-6XN alloy whereas small chipping, flank and CW were noticed during cutting 316 alloy. FEA study showed when the AL-6XN alloy machined using 65 and 94?m/min cutting speeds, the increases (compared to the 316 alloy) were: 12% and 8% in plastic strain; 20% and 20% in stresses; 48% and 100% in residual tensile stresses; 22% and 92% in residual compressive stresses, respectively. 相似文献
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Yisheng Chen Xueming Xu Baocai Xu Zhengyu Jin Ruixin Lim Mohanad Bashari Na Yang 《European Food Research and Technology》2010,231(5):719-726
This study highlights the microwave-assisted biosynthesis of glycerol monolaurate catalyzed by Novozym 435 in reverse microemulsion
system dispersed by Aerosol-OT. Optimization of key parameters including catalyst/surfactant loading and temperature showed
that under microwave irradiation, 125.9 mol L−1 (36 wt%) of glycerol monolaurate was achieved within 30 min, which had improved 150% compared with that of water bath under
the same conditions (60 °C, 1 wt% enzyme, 5 wt% AOT). Also, a synergistic effect of microwave irradiation and Aerosol-OT on
reaction and a decline of optimum temperature (from 70 to 60 °C) were observed in comparison with traditional heating. More
importantly, further comparative studies on morphology and chemicophysical profiles of reaction system heated by different
thermal modes revealed the following: (1) due to the volumetric and selective heating character of molecular heating, superiorly
larger interface of reaction system was formed under microwave irradiation, directly accelerating the reaction course investigated;
and (2) microwave irradiation more favored a less compact state of enzyme. And faster mobilities of lid structure of enzyme
were evident under microwave irradiation. This enhancement might facilitate the transition of conformational states, which
is of key importance for the activation of bioactivity of Novozym 435. Moreover, the stepwise changes in steady-state fluorescent
profiles demonstrated that the thermal-induced variation was not two-state transition but involves intermediate states, which
was further supported by activity measurements reflected in glycerol monolaurate yield. 相似文献
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Alhasanat Abdullah Alhasanat Mohanad Althunibat Saud Matrouk Khaled 《Wireless Networks》2019,25(7):4037-4048
Wireless Networks - In traditional Mobile Adhoc Networks routing algorithms, the existence of a sustainable path between the source and destination is a crucial issue. These algorithms are shown to... 相似文献
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Carbon-based nanofillers, such as carbon nanotubes (CNTs) and graphene sheets are considered as effective nanoreinforcements due to their unique structures and material performance. However, the utilisation of such nanofillers can be hindered owing to a high level of nanotoxicity via human inhalation and high material cost for CNTs, as well as the tendency to form agglomerates of graphene sheets in polymer matrices. Bamboo charcoals (BCs) are eco-friendly and sustainable carbon-based particles, which possess good affinity with polyvinyl alcohol (PVA), one of popular water soluble biopolymers, to achieve excellent properties of PVA/BC nanocomposites. In particular, porous structures of BC particles enable polymeric molecules to easily penetrate with the strong internal bonding. In this study, fully eco-friendly PVA/BC nanocomposite films were successfully fabricated using a simple solution casting method to achieve the high dispersibility of BCs. With the inclusion of only 3 wt% BCs, tensile modulus and tensile strength of PVA/BC nanocomposite films were enhanced by 70.2 and 71.6%, respectively, when compared with those of PVA films. Better thermal stability is manifested for resulting nanocomposite films as opposed to that of pristine PVA, which is evidenced by the maximum increase of 17.8% in the decomposition temperature at the weight loss of 80%. It is anticipated that BCs can compete against conventional carbon-based nanofillers with a great potential to be developed into eco-friendly nanocomposites used for thin-film packaging application. 相似文献