Based on a simple two layered marine model,the paper seeks a solution of marine seismic wavefield formed by the source in water when frictional drag of sea bottom can be neglected,gives a receiving character on sea bottom multi component receiver and obtains theoretic sea bottom multi component records from source in water by Fourier method.

The frictional characters, the influence of material compatibility, the effect of NBR deformation on the starting frictional drag of friction pairs used in ASP flooding are investigated.

The software based on the model is used to predict the frictional drag and hook load of running completion casing string in the experimental horizontal well (Well No. HW701) in Kelamayi oilfield, and the calculated results agree with the measured data.

This article offers a method for solving the frictional drag, that is, according to the various buckled shapes of coiled tubing in different hole sections, working out the mean contact counterforce in a screw pitch in solving the radial contact counterforce.

Drag reduction tests and wall concentration mea-surment for a 3.0m long flat plate and a 5.463m long body of revolution with polymer slot injection were carried out with Reynolds numbers in the range of 3.0× 106 to 5.4× 107. The maximum frictional drag reduction obtained are 45 percent and 39 percent repectively.

This paper tries to pinpoint the frictional drag coefficients of dilute polymer solutions flowing through canvas hoses, obtained by experimental methods.

The theory of Part I is extended to take account of vertical motion and frictional drag.

The generated oscillation may result in an optimization of the flow by reducing the net power loss to frictional drag.

Instabilities with reduced frictional drag in the rotating channel flow of dilute polymer solutions

Movement of the particles against the rotation of the magnetic system was due to the nonuniformity of the field at the drum surface and the frictional drag of the particles moving towards the permanent magnets.

We were able to quantitively account for these differences in a simple way by incorporating the frictional drag associated with the ion bound on the vortex core into the equations of motion.

Drag reduction tests and wall concentration mea-surment for a 3.0m long flat plate and a 5.463m long body of revolution with polymer slot injection were carried out with Reynolds numbers in the range of 3.0× 106 to 5.4× 107. The maximum frictional drag reduction obtained are 45 percent and 39 percent repectively.The tests of self-propulsion and noise measurments of a 5 bladed screw propelled 4.0m long body of revolution with polymer slot injection were conducted. The results obtained show that thrust deduction...

Drag reduction tests and wall concentration mea-surment for a 3.0m long flat plate and a 5.463m long body of revolution with polymer slot injection were carried out with Reynolds numbers in the range of 3.0× 106 to 5.4× 107. The maximum frictional drag reduction obtained are 45 percent and 39 percent repectively.The tests of self-propulsion and noise measurments of a 5 bladed screw propelled 4.0m long body of revolution with polymer slot injection were conducted. The results obtained show that thrust deduction fraction is slightly increased and wake fraction decreased.The level of noise spectrum of screw behind body of revolution is droped about 1 db with frequency in the range of 5-40kc.A differential relationship used to determine wall shear stress for streamline bodies of revolution with polymer injection is given and numerical calculation is conducted. Results of calculation for drag reduction are in good agrement with the above experimental data.

When it is required to check the ability of resisting frost heaving upswell of foundation pile, the frictional drag is currently taken as the same as the value of that for the axially tensile piles. The action of frost heaving counter-force to unfrozen soil by the process of freezing is analysed in the paper according to the stress state of the frost heaving upswell of foundation piles. It is pointed out that the interaction mechanism between foundation and piles during frost heaving upswell and ithe frictional...

When it is required to check the ability of resisting frost heaving upswell of foundation pile, the frictional drag is currently taken as the same as the value of that for the axially tensile piles. The action of frost heaving counter-force to unfrozen soil by the process of freezing is analysed in the paper according to the stress state of the frost heaving upswell of foundation piles. It is pointed out that the interaction mechanism between foundation and piles during frost heaving upswell and ithe frictional drag, distribution are both similar to the case of compressive pile. Therefore frictional drag of compressive pile is suggested to replace that of the tensile pile to check the ability of resisting frost heaving upswell of foundation pile.

If frictional drag is considered in the equation of gradient wind for a stationary typhoon with circularly symmetric distribution of pressure, the balanced equations for the forces can be expressed asSolving the above set of equations, velocity of gradient wind ν(k,c) and inner deflection angle β(k.c) can be obtained.ν(k.c) and β(k.c) represent the effects of frictional drag and moving velocity of typhoon respectively. Now, setting K = 0, we can find ν(0.c), and β(0.c) (here, β(0.c) = 0) ,and then...

If frictional drag is considered in the equation of gradient wind for a stationary typhoon with circularly symmetric distribution of pressure, the balanced equations for the forces can be expressed asSolving the above set of equations, velocity of gradient wind ν(k,c) and inner deflection angle β(k.c) can be obtained.ν(k.c) and β(k.c) represent the effects of frictional drag and moving velocity of typhoon respectively. Now, setting K = 0, we can find ν(0.c), and β(0.c) (here, β(0.c) = 0) ,and then define a frictional correction coefficient c as v(k.c)/v(0.c) (i.e. c = ν(k.c)°/ν(0.c)).In the case of Myers pressure expression, the computational results show.1. Both c and β are variables.The characteristics in their radial distributions are that c is about 0.6 at the edge of typhoon, and increases inward to nearly 1 in the vicinity of typhoon centre: β is about 35° at the edge and 2°-8° near the centre, it decreases inward;ν(k.c) reaches its minimum at the edge and the maximum appears at r = R0, it sharply decreases inward further.2. C and β are also related to the characteristic parameters △P, R0,,Yc and Vc. For instance, β decreasen and c increases when △P becomes larger. It is consistent with the case that typhoon develops and enhances the rota-tios of its flow.To sum up, the model proposed here is more reasonable than those with c and β as constants,in the simulation of wind field of real typhoon by using statistical data.