Fluid Flow In Tube Research Articles

NUMERICAL STUDY OF FLUID FLOW AND HEAT TRANSFER IN TUBE BANKS WITH STREAM-WISE PERIODIC BOUNDARY CONDITIONS

A numerical procedure for the calculation of laminar fully-developed cross-flow and heat transfer in tube-banks heat exchangers is presented. Boundary conditions are introduced in a form similar to the treatment at conventional inlets and outlets. Calculations are performed for in-line square, rotated square and equilateral triangle geometries, with pitch-to-diameter ratio 1.25-2, Reynolds number 101-103 and Pradtl number 1-100, under both constant heat flux and constant wall temperature boundary conditions. Overall pressure drop and heat transfer factors are compared to previous numerical work, empirical correlations and experimental data. Overall pressure drop calculations correlate with experimental data, while at low Reynolds number, heat transfer calculations are shown to depend upon the choice of reference bulk temperature in the rate equation. Graphs of local pressure, drag, and heat transfer coefficients are provided and discussed in detail.

Unsteady fluid flow in tubes and thinwall envelopes

Classical and new mathematical models describing the phenomenon of hydraulic shock are considered.

Течение жидкости в трубках с эластичными стенками

Течение жидкости в трубках с эластичными стенками

Specific features of motion of rheopectic fluids

Results of an experimental and theoretical investigation of rheopectic fluid flows in tubes are presented. Loss of stability and appearance of periodic and random self-oscillations are shown to be possible during motion of media with shear-strengthened structures.

Influence of solid deposits on the inception of self-excited thermoacoustic oscillations in heat transfer to turbulent fluid flow in tubes

It is established experimentally that solid carbon deposits formed in heat transfer to kerosene in small-bore tubes induce self-excited thermoacoustic oscillations.

Heat exchange in tubes with permeable walls in the presence of internal heat sources

Solutions are obtained for the energy equation for fluid flow in tubes with uniform injection of suction and heat sources in the stream.

Some experiments with biological applications for the elementary laboratory

Many departments are attempting to modify the elementary physics course to include applications of physics in areas of interest to the students. This paper gives summaries of laboratory experiments with applications in the biological sciences. The topics summarized are the mechanics of the human arm, fluid flow in tubes, physics of hearing, and the electrocardiograph. Also, mention is made of other suitable experiments: nerve impulse conduction and corrective lenses for eye defects.

Variational solution of axisymmetric fluid flow in tubes with surface solidification

The problem of axisymmetric heat conduction with internal surface solidification in the inlet regions of tubes is discussed. An approximate analytical solution is presented to this nonlinear, two-dimensional free-boundary problem. The analysis employs a variational technique which extends the Lagrangian formalism to treat the internal flow, two-dimensional moving-interface problems. The solution is expressed in terms of the short-time, asymptotic and steady-state components. Two forms of the variational solution are presented. One has limited validity in the entrance region of the tube, and the other, while less general, is more accurate. The results are compared with a finite-difference numerical solution. Agreement is of the order of 15 per cent.

Laminar, nonisothermal flow of fluids in tubes of circular cross section

AbstractNumerical solutions of the equations of motion and energy are presented in the form of pressure‐loss, flow‐rate relationships for the laminar, nonisothermal flow of Newtonian and non‐Newtonian fluids being heated and cooled in tubes at constant wall temperature. The flow properties are represented by a temperature‐dependent form of the power law equation. The numerical results are shown to be in good agreement with experimental data for a wide range of fluid properties and flow conditions.

Evaluation of kinetic energy losses in fluid flow in tubes

It is shown that use of the methods of the thermodynamics of irreversible processes allows one to evaluate the influence of blowing a homogenous gas on the kinetic energy losses in tube flow. Increase of blowing decreases the kinetic energy losses.