A design calculation method for capillary-tube oxygenators

1973 ◽  
Vol 11 (6) ◽  
pp. 732-742 ◽  
Author(s):  
Fernando Villarroel ◽  
Clifford E. Lanham
Keyword(s):  
Calculation Method ◽  
Capillary Tube ◽  
Design Calculation

Average Wall Radiative Heat Transfer Characteristic of Isothermal Radiative Medium in Inner Straight Fin Tubes

2021 ◽  
Author(s):  
Wenping Peng ◽  
Min Xu ◽  
Xiaoxia Ma ◽  
Xiulan Huai
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Radiative Heat Transfer ◽  
Calculation Method ◽  
Radiative Heat ◽  
Solid Surfaces ◽  
Design Calculation ◽  
Radiative Heat Transfer Coefficient ◽  
Fin Tubes

Abstract Wall radiative heat transfer in inner straight fin tubes is very complex considering the coupling of heat conduction in fins and radiative heat transfer of medium with solid surfaces, influenced by a number of factors such as fin parameters, radiative pro perties and run conditions. In this study, a simplified method is used.The average radiative heat transfer between radiative medium and solid surfaces is firstly studied by simulation with fins assumed having a constant temperature. Then an approximate correlation of this radiative heat transfer coefficient is proposed using the traditional radiative heat transfer calculation method with a view coefficient, having a error within 15%. A calculation method of average wall radiative heat transfer coefficient is further proposed by fin theory with an average temperature of fin surface used to consider the varying of the temperature along the fin when the conductivity of fins is finite. Using the predicting method proposed, a method for design calculation of fins in tubes to optimize wall radiative heat transfer is also given with three dimensionless numbers of p/n, 2H/D and nt/pD defined. Three cases of are analyzed in detail based on the design calculation method. It is verified that the radiative heat transfer could be enhanced twice by introducing fins. Under the same h0, conductivity and emissivity are two important factors to choose the material for fins.The micro-fins or the special treatments on the tube wall are a best choice for the fin material having a relatively small conductivity.

Design Calculation for Wedge Cam of Small Roller Centering Three-Jaw Jig

2015 ◽  
Vol 656-657 ◽  
pp. 641-645
Author(s):  
Nan Nan Xu ◽  
Wen Cheng Tang
Keyword(s):  
Numerical Calculation ◽  
Calculation Method ◽  
Economic Benefits ◽  
Quadratic Polynomial ◽  
Theoretical Curve ◽  
Design Calculation ◽  
Classic Method ◽  
Polynomial Curve ◽  
Sampling Points ◽  
Numerical Calculation Method

As wedge cam contour’s conventional equation of small roller centering three-jaw jig calculated by classic method is complex and difficult to be used for processing directly, a numerical calculation method for the wedge cam contour is proposed. Firstly, structure and working principle of centering small roller jig is introduced. Secondly, a new numerical calculation method sampling for wedge cam contour using equal step is presented, which can be obtained sampling points expression by numerical calculation model. Then,these samples points assignment will be fitting and interpolation in accordance with quadratic polynomial curve. The equation of quadratic polynomial interpolation on these sampling points these sampling will be obtained, which can be directly applied to NC programming. At last, through comparing fitted quadratic polynomial curve calculated by the numerical method with the theoretical curve calculated by classic method, it is found that the comparison tolerance is much smaller than conventional processing tolerance which is produced by using the theoretical curve for processing. The comparison tolerance is analyzed, refining the sampling step length and using piecewise fitting and interpolation loop calculation method is proposed,which can further improve numerical calculation accuracy to satisfy the requirement of higher and higher positioning. Therefore, it can be concluded that the numerical calculation method can effectively solve the difficult processing problem of wedge cam contour, which will produce better economic benefits.

Application of Long-Short-Pile Composite Foundation of High-Rise Building in Soft Soil

2012 ◽  
Vol 256-259 ◽  
pp. 57-60
Author(s):  
Rong Fang Song ◽  
Ling Yun Lang ◽  
Jing Wang
Keyword(s):  
Bearing Capacity ◽  
Calculation Method ◽  
Design Method ◽  
Soft Soil ◽  
Composite Foundation ◽  
Soft Ground ◽  
Design Calculation ◽  
Actual Measurement ◽  
High Rise ◽  
High Rise Building

A case of the long-short-pile composite foundation in liquefied soft soil under a 30-storey high-rise building is presented, in which the long and short piles are made of cement-flyash-gravel (CFG) and lime. A new design calculation method of bearing capacity and settlement of composite foundation is introduced, and the calculated value is compared with the actual measurement. The results show that the liquefaction of soft ground is eliminated and the demand of load and settlement for upper building is met. At the same time, it is proved that the design method is feasible.

Analysis on Stiff Frame in Replacement of Closure Segment for Prestressed Concrete Cable-Stayed Bridges

2013 ◽  
Vol 351-352 ◽  
pp. 1423-1431
Author(s):  
Hong Jiang Li ◽  
Da Yi Lu ◽  
Qi Feng Wang
Keyword(s):  
Prestressed Concrete ◽  
Calculation Method ◽  
Design Calculation ◽  
Working Process ◽  
Structural Dynamic ◽  
Internal Forces ◽  
Stage Analysis ◽  
Main Girder ◽  
Compression Member ◽  
Cable Stayed Bridges

Stiff frame was the important structural member in construction of replacement of closure segment for prestressed concrete cable-stayed bridges. To establish the design calculation method of it and reveal its variation of internal forces with construction stages of replacement, some configurations and its working process of stiff frame was introduced. Based on construction stage analysis of replacement, calculation methods of its strength and stability were given. Through FEM results, influence of stiff frame to structural dynamic property and global stability of whole bridge were described. Analysis results showed, it was appropriate to consider each section steel of stiff frame as eccentric compression member. During construction, the transversal global property of stiff frame and the security of its link with main girder must be valued. Construction results also proved, the theoretical calculation method could reflect the actual structural state of stiff frame, and its result was conservative. Analysis on stiff frame was an important part of replacement of closure segment, and could provide ways and references for construction control of replacement of closure segment.

Experimental Study on the Eligibility Percentage of Fuel WTD Valve Flow Test of X Engine

2013 ◽  
Vol 694-697 ◽  
pp. 526-531
Author(s):  
Yong Gang Xu ◽  
Qiang Wang
Keyword(s):  
Experimental Study ◽  
Normal Distribution ◽  
Calculation Method ◽  
Design Calculation ◽  
Fuel Distribution ◽  
Matching Test ◽  
Flow Test ◽  
Valve Housing

Experimental study was made to raise the eligibility percentage of the fuel WTD valve flow test of X engine, thus advancing the reliability of fuel distribution of the WTD valve. The spring--valve housing matching test of this paper demonstrates that the eligibility percentage is dependent not only on the spring height, but also intimately on the geometrical regularity of gain slots and return holes. The height-variable spring--valve housing matching test of this paper testifies that the eligibility percentage of spring matching vs. height has the characteristic of normal distribution, with the pre-calculated height at the normal peak. Therefore, the spring design calculation method referenced in this paper is practicable and reliable. The valve flow test shows it is improper to decide whether a spring can be used or not just on one spring--one valve housing basis. A suitable way is to match one spring to at least two to three valve housings in order to raise productivity and application of reliable springs.

Original design of coal-bed gas/air control units for engine-generator sets

2006 ◽  
Vol 220 (2) ◽  
pp. 179-184
Author(s):  
An-Ping Qiao ◽  
Yun-Qing Li ◽  
Feng Gao
Keyword(s):  
Coal Seam ◽  
Calculation Method ◽  
Combustion Engine ◽  
Control Unit ◽  
Coal Bed ◽  
Design Calculation ◽  
Original Design ◽  
Coal Seam Gas ◽  
Control Units ◽  
Generator Sets

An original air/fuel automatic mixing control unit for a coal-bed gas internal combustion engine and its matching generator, which is different from the conventional one, is introduced. The basic design and calculation method of this novel unit are explained. On the basis of these, the units of the 12V190ZDT type engine-generator sets are calculated and designed, machined, and trial-produced. A year's service-test at the Centre of West Coal Mine Construction shows that the performances of these devices are stable and reliable, and that this method could solve many practical problems that the old unit could not; for instance, working with mid-low concentration of coal-seam gas. They also fill a gap in the field of design, calculation, development, and application of coal-bed gas devices; the economic and social benefits are also truly remarkable. Therefore, the design and calculation method obtained in this article are important for engineering applications. This paper also offers a theoretical basis for the design and development of coal-seam gas engines or sets of engine-generator.

scholarly journals Experimental Investigation on the Pressure Distribution Law and Calculation Method of Muddy Water with High Silt Content

Geofluids ◽  
2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Lijia Zhong ◽  
Fengyin Liu ◽  
Bo Wang ◽  
Zhao Yang ◽  
Dong Zhou
Keyword(s):  
Pressure Distribution ◽  
Calculation Method ◽  
Water Pressure ◽  
Great Influence ◽  
Design Calculation ◽  
Distribution Law ◽  
Muddy Water ◽  
Silt Content ◽  
Result Analysis ◽  
Test Result

The pressure distribution law of muddy water with high silt content has great influence on the stress and strain calculation of the dam body. Currently, there is a few research studies referring to the calculation method of high silt content muddy water pressure, which leads to no reliable theoretical basis for muddy water pressure calculation in dam design. In this paper, muddy water with high silt content was prepared and the imitation tests and model tests were carried out to investigate the pressure distribution law. Based on the test result analysis, it is indicated that the muddy water with high silt content is also in a flowable and viscous state, which is consistent with the law of fluid behavior; the horizontal pressure is equal to the vertical pressure at the same position, and this relationship is generally time independent; through the test result analysis, a pressure formula for muddy water with high silt content is proposed; through comparison between the pressure formula-calculated results and monitoring data, it is indicated that the proposed pressure formula is applicable in the calculation of muddy water pressure. The formula can be a useful tool in the dam safety and design calculation.

Calculation Method of Upgrade and Side Strengthening Old Bridge Based on Applied Mechanics

2012 ◽  
Vol 214 ◽  
pp. 292-295
Author(s):  
Xiang Chao Zeng ◽  
Jing Yan Wang
Keyword(s):  
Calculation Method ◽  
Bridge Deck ◽  
Heavy Traffic ◽  
Mechanical Analysis ◽  
Design Calculation ◽  
Applied Mechanics ◽  
Reinforcement Scheme ◽  
Simply Supported ◽  
Reinforcement Measures ◽  
Reinforcement Design

Bridge of Car 15 levels will be upgraded to Car 20 levels, in order to meet the current heavy traffic. This article introduces reinforcement scheme, and the scheme of mechanical analysis, the reinforcement design calculation, and the corresponding conclusion. Reinforcement measures for, by simply supported a bridge deck continuous (two across connect), increase the clapboard to enhance structure integrity, stick steel to the side of the beam etc. The test is satisfactory.

The Principle and Calculation Method of Carbon Fiber Reinforcement for Tunnels and Underground Structures

2011 ◽  
Vol 94-96 ◽  
pp. 1247-1251
Author(s):  
Hong Ke Pan ◽  
Jiang Chun Hu ◽  
Lin De Yang
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Calculation Method ◽  
Underground Structure ◽  
Fiber Reinforcement ◽  
Bending Moment ◽  
Design Calculation ◽  
Underground Engineering ◽  
Single Section ◽  
Carbon Fiber Reinforcement

There will emerge cracks or damage due to the action of rock pressure or its own shortcomings and low strength for the lining structure in tunnel or underground engineering, especially at the places of excessive bending moment and tensile stress because of bias pressure where concrete will be pull apart for the deficiency of strength even to cause leakage and durability insufficient. Conventional maintenance and reinforce methods are time-consuming and laborious, and the effect is also not ideal. It is simple, timesaving and having a significant and lasting effect to use carbon fiber reinforcement method. This paper studied structure’s failure mechanism and on the basis of that the principle of fiber-plate reinforcement from the angle of structural plastic development, then studied the improvement of structure’s mechanical character and the change of design calculation method for single section of underground structure with carbon fiber plates by using the research method of plane-strain. At the same time, the typical model of integral failure for single section was analyzed and the calculation method and formulae of bearing capacity and reinforcing steel bars were deduced, which remedied the shortfall in the design specification for concrete structure. In the end, by comparing the calculation results of structure with fiber plates and that with not fiber plates based on engineering example, the conclusion that structure’s bearing capacity and capability of resistance to deformation had obvious improvement was obtained.

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