Experimental study on lubrication performance of main components of biodiesel

Author(s):  
Yonghui Wu ◽  
Fashe Li ◽  
Wenchao Wang ◽  
Zihao Ni ◽  
Baoping Ding ◽  
...  
2020 ◽  
Vol 1699 ◽  
pp. 012028
Author(s):  
Juan Chen ◽  
Liangcai Zeng ◽  
Min Yang ◽  
Wenting Guo

Nanofluid is the suspension formed by lubricating oil and nanoparticles with particles sizes of 1~100 nm, and common nanoparticles include metal nanoparticles (Cu, Ag, etc.), oxide nanoparticles (Al2O3, SiO2, ZrO2, etc.), carbides (CNT, diamond), and MoS2 nanoparticles, etc. Different nanoparticles exhibit various physicochemical properties (e.g., structure and shape), which can influence their tribological characteristics. In this work, six nanofluids, namely, MoS2, SiO2, diamond, carbon nanotubes (CNTs), Al2O3, and ZrO2, were used as minimum quantity lubrication grinding fluids to select the kind of nanoparticles with optimum lubrication performance in grinding nickel alloy GH4169. Experimental results concluded the following: 1) Nanoparticles with spherical or sphere-like molecular structure and nanofluids with high viscosity demonstrate superior lubrication performances. 2) The polishing effect of nanodiamond particles enhances their surface morphology. 3) The lubricating property of the six nanofluids is described in the following order: ZrO2 < CNTs < ND < MoS2 < SiO2 < Al2O3.


Author(s):  
Hanna Lulka ◽  
◽  
Marina Grinova ◽  

The phenomenological analysis of the essence of the concept of "tolerance" is carried out in the work; different possibilities of considering certain types of tolerance, the criteria of tolerance are characterized, the term "tolerant attitude" is analyzed, the content of the family's tolerant attitude to young school children is revealed. We have identified several levels of pedagogical conditions. The structure of the teacher's tolerant attitude to students is characterized, which is presented in the interaction of three leading components: The concept of "interaction" is defined, which is defined as a universal form of development that changes interacting objects that appear and lead each of them in a new way. Typical teacher interactions with young students, such as dialogue, cooperation and description, are highlighted. It was found that the main components of tolerance of young school-age children include: knowledge of tolerance, knowledge of the existence of differences in culture and ways of thinking about another ethnic, national or cultural background; formation of a friendly attitude to another person, as well as interest in gaining some experience of communication with representatives of another culture; development of cultural communication skills and conflict resolution skills. Thus, the results of theoretical and methodological analysis of scientific literature with research problems allowed to structure its categorical apparatus and organize an experimental study of pedagogical conditions of tolerant attitude to school and family to primary school students. In the section "Experimental study of pedagogical conditions of formation of tolerant attitude of school and family to children of young school age" the initial state of levels of tolerant attitude to pupils of initial classes is revealed; substantiated correctional program for the formation of a tolerant attitude of parents and teachers to young students in the process of pedagogical communication; the procedure and results of monitoring were carried out, which confirms the effectiveness of the experimental study. The study was conducted in accordance with the prices and objectives created in the work. By identifying the levels (high, medium, lower than average, low) of tolerant attitude to young students in the process of pedagogical communication, certain criteria were identified: meaningful, emotional, sensory, communicative and relevant indicators were developed. The quality of research methods were: description of teachers, testing, ascertaining experiment, mathematical and statistical methods of processing research materials. Parental intolerance is a factor in the object development of the child's personality (socio-pedagogical neglect), which manifests itself in the unformed in the authorities of the subject of self-awareness, communication and activity and concentrated development in the disturbed image of "I", socio-psychological maladaptation. Thus, solving the problems of parental tolerance requires parenthood, due to the violation of family upbringing, due to the intolerant attitude of parents to others, one of them and the children. The obtained information complements the scientific ideas about the psychology of parenthood in parts regarding the formation of the structure of parental tolerance and its interaction with the development of the child's personality.


2011 ◽  
Vol 199-200 ◽  
pp. 659-669
Author(s):  
Yong Guo ◽  
Wei Jun Zhao ◽  
Ling Yang ◽  
Xiao Yang Yuan

This paper reports a case of lubricating property test of bearing. In order to seize the performance and the reasonable work condition of Ф480mm elliptical bearing with groove on all pads for 1000MW steam turbine, an experimental method that load is on the rotor was adopted in this paper. And the test focused on the bearing characteristics which is most concerned by designers such as power loses, temperature, flow, and flow state, etc. The influence on power loses, temperature rise, flow by the temperature and pressure of inlet oil, load, speed was studied in this test. The results show that the flow state in this bearing is changed from laminar to turbulent in the speed range 2000rpm~2200rpm and in the Reynolds number range 1325.8~1556.5. The specific pressure for the bearing with groove on the down pad is proper between 1.57MPa and 1.96MPa.


2014 ◽  
Vol 962-965 ◽  
pp. 1020-1024
Author(s):  
Kai Hua Sun ◽  
Rui Zhang

In order to reduce the cost of stowing materials in Yuyang coal mine, and localize the stowing material, a series of experiments were conducted, which were based on the sampling and testing of aeolian sand to analyze the reaction mechanism of paste-like stowing slurry. The influence of different aeolian sand and auxiliary material content on stowing material was also studied in the experiment. Experimental results indicate that the main components of aeolian sand are SiO2 and Al2O3. The stowing material density increases by 23.4% with more aeolian sand additive amount, and the material cost falls to 93 yuan/m3, reduced by 25.6%. With the increase of auxiliary gelatinization material dosage, the 28-day strength of material increases by 59.4%, the hardening rate of stowing material reaches up to 109.5%, increased by 23%, and the stowing material shows micro expansion.


2014 ◽  
Vol 66 (3) ◽  
Author(s):  
S. M. Hafis ◽  
M. J. M. Ridzuan ◽  
A. R. Mohamed ◽  
R. N. Farahana ◽  
S. Syahrullail

The abundance of palm pressed fibre (PPF) biomass waste generates greenhouse gases. Therefore, an experimental study on catalytic pyrolysis technology using a tubular reactor on PPF oil was performed at temperature of 450 oC, which gave oil product yields of 44.1 percent. Viscosity of the PPF oil as a function of temperature was measured at different temperatures ranging from 25 oC to 50 oC. The viscosity of the oils was shown to decrease with increases in temperature. Finally, PPF oil was tested as lubricant in strip drawing and compared with palm olein (PO). A comparison of strip drawn aluminium samples show that the lubrication performance of PPF oil varies with PO in a remarkably similar way.


2019 ◽  
Vol 196 ◽  
pp. 00048
Author(s):  
Dmitrii Samoshkin ◽  
Alibek Agazhanov

The article adduces new reliable experimental data on the thermal conductivity and the thermal diffusivity of hard magnetic materials of brands N35M, N35H, N35SH, as well as YX18, YX24 and YXG22, YXG30 with main components represented by the crystalline phases of Nd2Fe14B, SmCo5 and Sm2Co17 type, respectively. The temperature range from 293 to 773…1273 K has been investigated by laser flash technique with an error of 3—4%. The reference tables of the thermal diffusivity and thermal conductivity coefficients have been developed. The character of the thermal diffusivity changes near the Curie point has been determined. The critical indices and the critical amplitudes have been defined.


Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 23 ◽  
Author(s):  
Zhongliang Xie ◽  
Zhushi Rao ◽  
Huanling Liu

This study explored the influence of the surface topography of a bushing on the lubrication performance of a water-lubricated bearing. Bushing deformations were considered in the mathematical model. Theoretical calculations and experiments were performed. The test data corresponded well with the simulation. The main stiffness and cross stiffness coefficients were measured and compared with the theoretical values, and the empirical formula of friction coefficient was fitted based on the test data.


2018 ◽  
Vol 159 ◽  
pp. 02021 ◽  
Author(s):  
Imam Ridwan Tanaka ◽  
Berkah Fajar ◽  
Tony Suryo Utomo ◽  
Eflita Yohana ◽  
Mustaqim

Refrigerant 22 or called R-22 is still the most widely used for air conditioners. However, since it has a relatively high global warming properties, the use of R-22 should be stopped. Refrigerant 290 briefed as R-290 (propane) is the type of refrigerant recommended by many experts for R-22 replacements because the global warming properties of R290 are much lower than R-22. Therefore, in this study the cooling capacity, flow rate mass, power consumed and COP will be evaluated. The air conditioner engine used in this research has 1 PK capacity which is redesigned by adding separator / ducting on various main components of AC. From the result of the study, there are several conclusions revealed: on the same compressor capacity, R-22 cooling capacity is still greater than R290. Meanwhile, the flow rate of R290 is lower than R-22. For power consumption from R-290, it is smaller than R-22. For the value of COP R-290, the value shows greater ie at R-290 on the variation of Incoming Temperature In Evaporator 20°C = 6.23, 23°C = 6.36, 25°C = 6.86, 29°C = 6.20. While at R-22, it shows 20°C = 5.36, 23°C = 6.02, 25°C = 5.76, 29°C = 6.335


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