Local and average heat transfer coefficients for heat transfer from internal tubes to a fluidized bed were investigated. A fluidized bed heat exchanger was compared to a baffled and an unbaffled exchanger in terms of power and heat transfer surface area requirements. The fluidized bed heat exchanger consisted of a...
Momentum transfer in an annular duct with upward gas-Iiquid
flow was studied under the condition that the liquid flowed as a film
only on the inner core of the annulus, the outer wall remaining dry.
Previous workers have studied climbing and falling liquid
films in tubes or on vertical planes....
Incipient boiling and burnout heat fluxes were studied for sub-cooled forced convection annular flow. Small wires varying from 0.010
to 0.020 inch in diameter were used as the inner core of the annulus
and a one inch ID glass tube 24 inches long was used as the outer tube.
This...
An analysis of the velocity and the shape of large gas bubbles
rising through tubes filled with viscous liquids is presented. Four
tubes, with diameters ranging from 0. 446 inches to 3. 97 inches, and
three liquids, with viscosities ranging from one to 200 centipoise,
were used in the study....
The purpose of this research was to study the effect of capillary
tube dimensions on the apparent viscosity of an unstable dispersion
of two immiscible liquids. The study was limited to laminar
flow at a constant temperature.
The dispersions were composed of a commercial solvent,
Shellsolv 360, manufactured by the...
Drop size distributions produced by the turbulent pipe flow of
dispersions of immiscible liquids were measured photographically.
A mathematical model was developed which predicted both the shape
of the experimentally observed distributions and the experimentally
observed kinetics of the breakup process.
The mutually saturated water and organic phases were pumped...
Heat transfer from the inner wall of an annulus to subcooled
water in turbulent parallel flow was studied. The inner core of the
annulus consisted of wires varying from 0.0019 to 0.0197 inch in
diameter. The outer tube consisted of a 1.01 inch diameter glass
tube 24 inches long. Diameter...
This paper describes a study of two-phase gas-liquid vertical
annular climbing film flow. Using a high speed Fastax movie camera,
motion was slowed sufficiently to facilitate detailed analysis of the
climbing film structure, based on single frame projections. The
dynamic characteristics of the liquid film could likewise be obtained,
though...
Friction factors were measured for water flowing in ducts made
up of two rods held between two flat plates. Three rod diameters of
0.50, 1.00 and 1.50 inches were used. The spacings between rods
varied from 0.0 to 0.32 inch. It was found that the concept of
hydraulic diameter was...
The turbulent interchange of matter between parallel adjacent
subchannels in a simulated rod bundle for single phase flow was investigated
to determine the effects of mass flow rate and rod spacing.
The simulated rod bundle was made by placing six 1-inch diameter
rods in a square-square array. The overall test...
Momentum transfer in climbing-film flow in an annular duct was
investigated. Air and various liquids, with a wide range of viscosities
and surface tensions, were investigated. The two phases flowed co-currently
upward, the liquid climbing as a thin film on the inner wail
while the outer wall remained dry.
The...
The effects of mass flow rate and subchannel configuration on
the turbulent interchange between adjacent subchannel in simulated
rod bundle were investigated.
The simulated rod bundle was made by arranging seven 1.913 cm
diameter acrylic plastic rods in an equilateral triangular pattern in a
tube 8.89 cm inside diameter.
The...
Turbulent mixing across adjacent subchannels in packed rod
bundles was studied using conductivity measurement and sodium
chloride solution as the tracer. Single phase water was the fluid
investigated.
The packed rod bundles were seven stainless steel tubes,
1.905 cm in diameter and 152.4 cm long, arranged in hexagonal close-packed
configuration...
A cooling tower system was built and fouling resistances were
studied for cooling water flowing over a heated tubular surface. The
cooling water studied was formulated in an effort to match industrial
cooling water quality. The water used in this study had an average
Ryznar Stability Index of 6.23 and...
Deposition characteristics of magnesium silicate and calcium carbonate on a heated surface in cooling tower water using city water as make-up was investigated. Flow velocity, bulk temperature and calcium hardness were maintained constant at 5.3 ft/ sec, 95°F and 150 ppm as CaCO₃ respectively whereas surface temperature varied from 105°F...
Scaling characteristics of calcium carbonate on a
heated surface in cooling tower water was investigated.
Bulk temperature was maintained constant at 95°F. Flow
velocities and surface temperatures ranged from 3 ft/sec to
10.3 ft/sec and from 105°F to 170°F respectively. City
water was used as make-up for two different water...
The fouling of cooling tower water was investigated as
a function of heater surface temperature and water quality.
In particular, the effects on fouling of the addition of
calcium in excess of the amounts required for saturation
were examined.
First, the average bulk water temperature was 97 ± 1
degree...
The fouling characteristics of simulated cooling tower water flowing over a heated metallic surface has been studied. The bulk temperature of the water was maintained around 95°F. Mainly three different water qualities with respect to calcium hardness level were investigated. The pH was controlled by the addition of hydrochloric acid....
Scaling characteristics of calcium carbonate on a heated surface
in a deluged dry cooling system were investigated. Bulk temperature
of the deluge water was maintained constant at 90°F. Air flow velocity was maintained constant at 181 cfm., and deluge water flow was
maintained at the minimum level that provided thorough...
Various conditions of heat flux in the range of 46600 to 93300 Btu/hr ft² and water velocity in the range of 1.44 to 2.16 ft/sec were tested under carefully controlled conditions to determine their effect on scale formation, and the characteristics of scale. Inlet temperature and bulk temperature were maintained...
A bench-scale thermosiphon reboiler system was constructed
end used to investigate the scaling behavior of aqueous calcium
sulfate under flow boiling conditions. Scaling data were collected
at constant heat flux from eight experimental runs. Five different
constant heat fluxes were used ranging from 45000 to 93000 Btu/hr. ft², in increments...
Nucleate boiling of water in a vertical annulus was
studied. The test section was entirely of stainless steel
construction and was formed by a length of stainless steel
tubing with a stainless steel heater rod centered in it. Two
test sections with length to diameter ratios of 18 and 33...
A study of nucleate boiling of water, four alcohols and
three ethanol-water mixtures was conducted in a vertical
thermosiphon reboiler. The test section consisted of a 1/2-
inch diameter electrically heated stainless-steel rod
jacketed by a 15-inch long pyrex glass tube. Two different
inside diameters of the glass tube corresponding...
Various antifoulant treatment programs and the
considerations necessary for the effective use of such
programs were examined.
Two different groups of tests, with and without
iron contamination, have been carried out on the
effectiveness of several of the state-of-the-art
copolymers (PA, HEDP, AA/HPA, AA/MA, SS/MA and AA/SA) in
the inhibition...
Heat transfer to moving packed beds of solids has been studied
extensively but predictions are usually specific to the experimenter's
own equipment. In order to obtain a more general predictive equation,
the heat transfer coefficient was measured for a single vertical tube
immersed in a moving packed bed of glass...