Momentum and heat transfer for pulsating laminar flow

Thesis/Dissertation · Fri Dec 31 23:00:00 EST 1976

OSTI ID:5371642

Render, D J

Behavior of laminar, incompressible flow in the entrance region of a tube under the influence of sinusoidal velocity pulsations superposed on a mean throughflow was studied. The resultant flow characteristics and wall heat transfer rates were studied for the range of conditions over which no flow reversal takes place. A numerical computation technique has been developed which solves the unsteady momentum an energy equations in an explicit fashion, eliminating iteration. The solution program permits a tube wall temperature which varies with axial distance and temperature-dependent fluid viscosity. Key elements in the solution technique are a coordinate transformation to a system involving the stream function as a radial dimension, integration of the governing differential equations over a control volume to yield difference equations, assumptions concerning variation of unknowns to eliminate matrix inversion or iteration, and determination of the local, time-dependent longitudinal pressure gradient from local flow phenomena.

• OSTI ID: 5371642
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
COMPUTER CALCULATIONS
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
FLOW RATE
FLUID FLOW
FREQUENCY DEPENDENCE
HEAT TRANSFER
INCOMPRESSIBLE FLOW
ITERATIVE METHODS
LAMINAR FLOW
NUMERICAL SOLUTION
PRESSURE DROP
PRESSURE GRADIENTS
PULSATIONS
TUBES
VELOCITY