Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 36 for “"Stratified flow"”.
-
Heat transfer in stratified flow.
… buoyant jets. Under steady state conditions the flow consists of a surface layer entraining fluid from below and losing heat at the surface. This layer subsides at the downstream boundary of the pond and passes through the pond outlet. A recirculation eddy is formed under the surface flow to …
-
An experiment in stratified flow.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1966. M.S.
-
Sluice gate discharge of stratified flow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1954.
-
Continuously Stratified Flow Dynamics Over a Hollow
… the effects of a hollow on a continuously stratified flow. Measurements showed an acceleration of the near-bottom flow as it moved toward the deepest part of the hollows, in contrast to the deceleration expected from two-dimensional Bernoulli-type dynamics. The acceleration was attributed …
-
Some aspects of stratified flow in closed conduits
In this work, four investigations of stratified flow were conducted in closed conduits, which included, l. numerical solution of velocity distribution by using a digital computer, 2. analytical solution and experimental verification of the internal surge wave velocity, 3. experimental observation …
-
Trapped disturbances and effects of tropopause height in stratified flow over topography
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
-
Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
… works considered two different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly expanding relatively well mixed region near the shore and the second considered a steady flow that arises …
-
Developing a novel mechanistic model for four-phase oil-water-gas-sand stratified flow in a horizontal pipe.
… of blockage. Transporting sand along with other flowing phases is the best way of managing produced sand. Pipelines should be designed in such a way that flowing phases keep the sand particles moving and formation of the stationary sand bed should be mitigated by understanding flow physics under …
-
Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
… works considered two different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly expanding relatively well mixed region near the shore and the second considered a steady flow that arises …
-
A study of two-phase flow in a large diameter horizontal pipeline and the measurement of interfacial level gradient in smooth stratified flow conditions
… study investigates the behaviour of two-phase flow in large diameter horizontal pipelines. The study was divided into two main parts: (i) General two-phase flow in 203 mm diameter pipeline, where the pressure drop and void fraction were measured. The pressure drop was measured using 23 bottom …
-
The role of background flow variations in stratified flows over topography
… feature density variations with depth, the flow of a density-stratified fluid over topography is central to various geophysical and meteorological applications and has been studied extensively. For reasons of convenience and mathematical tractability, the majority of theoretical treatments …
-
Air-water transfer at wavy interfaces
… This thesis relates oxygen absorption rates in stratified flow to the interfacial structure and to the near-interface hydrodynamics of the liquid.
-
Slug Formation and Frequency of Slugging in Gas-Liquid Flows
… liquid buildup. When the Froude number of the stratified flow in a horizontal pipe at the onset of slug flow is less than unity, the frequency is related to the motion of upstream propagating gravity waves associated with the formation of slugs. A stochastic model is used to describe the …
-
Mixing in stably stratified turbulent flows: improved parameterizations of diapycnal mixing in oceanic flows
… phenomenon in both natural and engineered flows. Fundamental understanding and quantitative prediction of turbulent mixing in stratified flows is a challenging problem, with a broad range of applications including (but not limited to) prediction of climate, ocean thermohaline circulation, …
-
Study of the role of differential diffusion and equation of state on the features of stably stratified turbulent channel flow using direct numerical simulations
Stably stratified turbulent flows are observed in many systems, ranging from engineering applications to environmental flows. The density variation in such flows, particularly that observed in water bodies depends on temperature and salinity (salt content) through an equation of state (EoS). The …
-
Effect of inclination on pressure drop and flow regimes in large flattened-tube steam condensers
… of the inclination effect on pressure drop and flow regime during condensation of steam in a large flattened tube used in air-cooled condensers (ACC) for power plants. Steam with mass flux of about 7 kg m-2 s-1 was condensed inside a 10.7 m long, flattened test tube with inclination angle varied …
-
Investigation of MELCOR and STAR-CCM+ modeling capabilities to accurately predict air ingress rates from small breaks in high temperature gas-cooled reactors
… differences of helium and air. This leads to a stratified flow through the break, with the lighter helium flowing above the heavier air. This thesis aims to investigate the modeling capabilities of MELCOR and STAR-CCM+ for small break air ingress events. Initial tests present a generic model to …
-
Evaluation of RANS-Based Turbulence Models for the Propagation of Stratified Fronts in Buoyancy-Driven Flow
… buoyancy-driven f lows, including thermally stratified flow. Inaccuracies in these cases are often attributed to the Reynolds analogy, a simplification of the turbulent heat flux. To evaluate the validity of the Reynolds analogy under thermal stratification, the HiRJet experiment was …
-
The effect of operating conditions on emissions from a two-stage lump coal combustor
… that were varied include primary air mass flow rate, secondary air mass flow rate, secondary air temperature, secondary air inlet velocity, and secondary air swirl. Each parameter was varied independently to attempt to isolate its effect on emissions. In addition, radial and axial probe …
-
A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… The governing equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of suspended sediment, temperature, and salinity induced stratification on the vertical …
Page 1 of 2