Spelling suggestions: "subject:"heat exchanger -- fluid dynamics"" "subject:"heat exchanger -- tluid dynamics""
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Dynamic characteristics of a crossflow heat exchanger subjected to fluid velocity variationsSulkowski, Eugene Joseph, January 1968 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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An experimental study of co-flow ammonia-water desorption in an oil-heated, microscale, fractal-like branching heat exchangerMouchka, Gregory A. 24 March 2006 (has links)
An experimental study was performed in which an ammonia-water solution
was desorbed within a branching fractal-like microchannel array. The solution entered
in the center of a disk, and flowed out radially until discharging in to a gravity-driven
separation chamber. Heat was added to the ammonia-water through a thin wall, above
which flowed heat transfer oil in a separate branching fractal-like microchannel array.
Such arrays have been shown to utilize the increased heat transfer coefficients seen in
parallel channel arrays; however, they do so with a lower pressure drop.
An experimental flow loop consisting of ammonia-water and heat transfer oil
sub-loops was instrumented along with a test manifold for global measurements to be
taken. Temperature, pressure, density and mass flow rate measurements permitted
calculation of desorption and heat transfer characteristics. Parameters included oil
mass flow rate, oil inlet temperature, and strong solution flow rate, while strong
solution concentration, temperature, and weak solution pressure were kept constant.
The desorber was assumed to achieve equilibrium conditions between the
vapor and weak solution in the separation chamber. The exit plenum was large and
acted as a flash chamber, making the assumption reasonable. The vapor mass fraction
was determined from knowledge of the weak solution saturation temperature.
Heat exchanger analyses (LMTD and ε-NTU) were done to determine the heat
transfer characteristics of the desorber. Calculated values of UA are shown to be as
high as 5.0 W/K, and desorber heat duties were measured as high as 334 W. Strong
solution, at 0.30 mass fraction, was desorbed into weak solution and vapor with
concentrations ranging from 0.734 to 0.964. Circulation ratios, defined as strong
solution mass flow rate per unit desorbed vapor mass flow rate, varied in this study
from 3.4 to 20.
A method for specifying desorber operating conditions is described, in which a
minimum desorber heat input per unit vapor flow rate is determined at an optimum
circulation ratio. A description of how the circulation ratio behaves as a function of
strong solution mass flow rate, oil flow rate, and the maximum temperature difference
between oil and ammonia-water solution is shown. / Graduation date: 2006
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Investigation of a self compensating flow distribution systemBruzzano, Marco Anthony 08 1900 (has links)
No description available.
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Theoretical investigation of the transient behaviour of heat exchangersDavies, H. E. January 1964 (has links)
No description available.
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Flow through a model fin and tube heat exchanger and its influence on mass and heat transferGilbert, Gregory P. (Gregory Phillip) January 1987 (has links) (PDF)
Bibliography: leaves 114-119.
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Investigation of fluidized reactor systemsStoneburner, John Fredrick, 1930- January 1962 (has links)
No description available.
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Condensation heat transfer and pressure drop coefficients of R22/R142b in a water cooled helicaly coiled tube-in-tube heat exchanger.Kebonte, Shiko A. 20 August 2012 (has links)
M.Ing. / Heat transfer and pressure drop characteristics during in-tube condensation of nonazeotropic mixtures of R22/R142b in a smooth helically coiled copper tube with an inside diameter of 8.11 mm are investigated. The experimental results are compared with prediction from correlation. The coefficient of performance of.the heat pump built and used for experiments has been studied. The mass flux of the refrigerant was varied during the course of the experiments. At similar mass flow rate of fluids, the average heat transfer coefficients for mixtures were lower than those for pure refrigerant R22 used as reference for comparison. Also, the heat transfer coefficients of all the refrigerants increased with increasing mass flux.
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Condensation heat transfer and pressure drop of propane in vertical minichannelsMurphy, Daniel Lawrence 22 May 2014 (has links)
Heat transfer and pressure drop during condensation of propane flowing through minichannels is investigated in this study. Studies of condensation of hydrocarbons are important for applications in the petrochemical industry. Insights into the mechanisms of propane condensation are required for accurate design of heat transfer equipment for use in hydrocarbon processing. At present, there is very little research on vertical condensation, especially of hydrocarbons, for the tube sizes and flow conditions of interest to the present study. An experimental facility was designed and fabricated to measure the frictional pressure drop and heat transfer coefficients during condensation of propane in plain tubes with an inner diameter of 1.93 mm. Measurements were taken across the vapor-liquid dome in nominal quality increments of 0.25 for two saturation temperatures (47°C and 74°C) and four mass flux conditions (75 – 150 kg m‾² s‾¹). The data were compared to the predictions of relevant correlations in the literature. The data from this study were also used to develop models for the frictional pressure drop and heat transfer coefficient based on the measurements and the underlying condensation mechanisms. These results and the corresponding correlations contribute to the understanding of condensation of hydrocarbons in vertical minichannels.
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