Micro-grooved hybrid spherical thrust bearing with Non-Newtonian lubricant behaviour

Agrawa, Nitin; Sharma, Satish C.

doi:10.1016/j.ijmecsci.2022.107940

Cited by 13 publications

(8 citation statements)

References 66 publications

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“…The viscosity and shear stress mode of SP dressing were also tested as shown in Figure F; the results presented that along with the shear rate from 0 to 1000 (1/ s ), the viscosity and shear stress ability declined sharply from 0.13 to 0.01 Pa s, but the shear rate increased significantly from 0 to 14 Pa; this result of SP dressing is typically consistent with the behavior of a non-Newtonian fluid . On the other hand, the shear stress mode of the SP dressing was also tested by the storage modulus E′ and the loss modulus E″ (as shown in Figure G).…”

Section: Resultsmentioning

confidence: 99%

“…The viscosity and shear stress mode of SP dressing were also tested as shown in Figure 2F; the results presented that along with the shear rate from 0 to 1000 (1/s), the viscosity and shear stress ability declined sharply from 0.13 to 0.01 Pa s, but the shear rate increased significantly from 0 to 14 Pa; this result of SP dressing is typically consistent with the behavior of a non-Newtonian fluid. 44 On the other hand, the shear stress mode of the SP dressing was also tested by the storage modulus E′ and the loss modulus E″ (as shown in Figure 2G). From the time of 0 to 300 s, the storage modulus E′ increased greatly from less than 1.0 × 10 4 to more than 1.0 × 10 5 Pa, but the loss modulus E″ was kept at a constant volume of 1.0 × 10 5 Pa, and the solidification process of the SP solution was short to be 70 s, which indicated a rapid sealing ability and suitability for an acute wound.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Bioinspired Natural Shellac Dressing for Rapid Wound Sealing and Healing

Liu,

Li,

Dong

et al. 2023

ACS Appl. Mater. Interfaces

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Developing safe and effective wound dressings that address the complexities of wound healing is an ongoing goal in biomaterials research. Inspired by the shield used to protect lac insects, we have designed and developed a type of bioactive shellacbased wound dressing in this paper. The dressing exhibited a high adhesion energy of 146.6 J•m −2 in porcine skin and showed a reversible binding due to its pH sensitivity. Meanwhile, a novel "shellac-like" compound, n-octacosanol gallate ester, has been synthesized and added to the dressing to improve its antibacterial and blood coagulation properties. The novel shellac-based dressing could be sprayed to form a sticky film within 70 s for rapid hemostasis and wound sealing, which could be conveniently applied to various wounds on extensible body parts. In addition, the shellac-based dressing can actively promote the healing of a full-thickness wound in the skin of mice. We also used molecular dynamics simulations to investigate the interactions between the shellac molecule and the phospholipid bilayer and attempted to show that the shellac molecule was beneficial for wound healing. This work provides a novel and practical bioinspired wound dressing with significant properties, facile preparation, and ease of use, which is an interesting alternative to its traditional counterparts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Bioinspired Natural Shellac Dressing for Rapid Wound Sealing and Healing

Liu,

Li,

Dong

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Soni 53 investigated the numerical solution to predict the dynamic performance of finite bearing considering the combined influence of turbulence regime and non-Newtonian flow. Agrawal and Sharma 54 examined the performance of micro-grooved hole-entry hybrid spherical thrust bearing (HSTB), considering the non-Newtonian behavior of the lubricant. Hashemabadi and Mirnajafizadeh 55 solved the lubrication problem analytically by considering the SPTT model as representing fluid.…”

Section: Introductionmentioning

confidence: 99%

An analytical study on nonlinear viscoelastic lubrication in journal bearings

Abbaspur,

Norouzi,

Akbarzadeh

et al. 2023

Sci Rep

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This paper presents a novel analytical solution for journal-bearing viscoelastic lubrication using the perturbation method. The nonlinear Giesekus model was used for the constitutive equations to study the effects of fluid elasticity, shear-thinning viscometric functions, and strain-hardening elongational viscosity of viscoelastic lubrication. The investigation focuses on the impact of characteristic parameters such as mobility factor, eccentricity ratio, and Weissenberg number on the fluid film pressure distribution, load capacity, and shear stress. Although distinguishing between the normal stress differences and extensional viscosity in mixed viscoelastic flows is complicated, we investigated the role and contribution of these two factors. By increasing the elasticity of the fluid, the portion of both mentioned parameters increases consequently. Furthermore, analyses and comparisons show the contributions of the first normal stress and elongational viscosity to the load capacity of the bearing through the stress ratio and flow type parameter for the first time. The research findings indicate that fluid elasticity enhances the load capacity of the bearing compared to a Newtonian lubricant with the same effective viscosity. Moreover, the bearing load capacity is divided into two regions. In the linear region, the mobility factor and Weissenberg numbers have minimal effects leading to a linear increase in the load distribution, and in the exponential region, the load capacity changes are considerable. This research provides valuable insights into the behavior of viscoelastic lubrication in journal-bearing systems.

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“…During the ship construction phase, the installation quality of the propulsion shaft system directly affects the lubrication statuses of the bearings. The quality of the shaft system installation not only affects the ship construction progress, but also the safety, stability, and reliability of the shaft system [1][2][3]. During the trial voyage of a 22,000 m 3 liquefied gas ship in 2004, the installation error of its stern bearing caused serious damage to the inner surface of the fore stern bearings of the stern tube [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Lubrication Characteristics of Ship Stern Bearings Considering Bearing Installation Errors

Yang,

Zhu,

Fan

et al. 2023

Lubricants

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The installation quality of a propulsion shaft system directly affects the lubrication statuses of the bearings. The quality of the shaft system installation not only affects the progress of ship construction, but also the safety, stability, and reliability of the shaft system. This article takes sliding bearings in ship shafting as the research object and establishes a hydrodynamic lubrication model of sliding bearings while considering installation errors to address the issue of installation errors of ship stern bearings. The finite difference method and super-relaxation iteration method are used to solve the problem, and the influences of bearing installation errors on bearing lubrication characteristic parameters are explored. An installation error of the stern bearing can lead to an increase in the film pressure at both ends of the stern bearing in the axial direction, leading to a decrease in the lubrication status of the bearing. Poor lubrication and wear faults of the stern bearing are prone to occur at both ends of the stern bearing. As the installation error of the stern bearing increases, the minimum film thickness of the stern bearing decreases and the maximum film pressure increases, and as the installation error increases, the sensitivity of the aft stern bearing to the vertical installation error is greater than that of the lateral installation error, and the sensitivity of the fore stern bearing to the lateral installation error is greater than that of the vertical installation error. The sensitivity of the lateral and vertical film forces at both ends of the aft stern bearing and the fore stern bearing is greater than that of the middle part; the installation error of bearings has a significant impact on the lubrication characteristics of bearings.

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Micro-grooved hybrid spherical thrust bearing with Non-Newtonian lubricant behaviour

Cited by 13 publications

References 66 publications

Bioinspired Natural Shellac Dressing for Rapid Wound Sealing and Healing

Bioinspired Natural Shellac Dressing for Rapid Wound Sealing and Healing

An analytical study on nonlinear viscoelastic lubrication in journal bearings

Research on Lubrication Characteristics of Ship Stern Bearings Considering Bearing Installation Errors

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