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This Brief reports on heat transfer from a solid boundary in a
saturated porous medium. Experiments reveal overall heat transfer
laws when the flow along the wall is driven by buoyancy produced by
large temperature differences, and mathematical analysis using
advanced volume-averaging techniques produce estimates of how heat
is dispersed in the porous zone. Engineers, hydrologists and
geophysicists will find the results valuable for validation of
laboratory and field tests, as well as testing their models of
dispersion of heat and mass in saturated media.
This SpringerBrief presents a recent advancement in modeling and
measurement of the effect of surface wettability on the defrost
process. Carefully controlled laboratory measurements of the
defrosting of cooled surfaces are used to reveal the effect of
surface wetting properties on the extent and speed of frost removal
by melting or slumping. The experiments are accompanied by
visualization of frost removal at several defrosting conditions.
Analysis breaks the defrost process into three stages according to
the behavior of the meltwater. Surface wetting factors are
included, and become significant when sufficient meltwater
accumulates between the saturated frost layer and the surface. The
book is aimed at researchers, practicing engineers and graduate
students.
Natural Convection in Composite Fluid-Porous Domains provides a
timely overview of the current state of understanding on the
phenomenon of convection in composite fluid-porous layers. Natural
convection in horizontal fluid-porous layers has received renewed
attention because of engineering problems such as post-accident
cooling of nuclear reactors, contaminant transport in groundwater,
and convection in fibrous insulation systems. Because applications
of the problem span many scientific domains, the book serves as a
valuable resource for a wide audience.
This Brief describes and analyzes flow and heat transport over a
liquid-saturated porous bed. The porous bed is saturated by a
liquid layer and heating takes place from a section of the bottom.
The effect on flow patterns of heating from the bottom is shown by
calculation, and when the heating is sufficiently strong, the flow
is affected through the porous and upper liquid layers.
Measurements of the heat transfer rate from the heated section
confirm calculations. General heat transfer laws are developed for
varying porous bed depths for applications to process industry
needs, environmental sciences, and materials processing. Addressing
a topic of considerable interest to the research community, the
brief features an up-to-date literature review of mixed convection
energy transport in fluid superposed porous layers.
This Brief is aimed at engineers and researchers involved in the
refrigeration industry: specifically, those interested in energy
utilization and system efficiency. The book presents what the
authors believe is the first comprehensive frost melting study
involving all aspects of heat and mass transfer. The volume's
description of in-plane and normal digital images of frost growth
and melting is also unique in the field, and the digital analysis
technique offers an advantage over invasive measurement methods.
The scope of book's coverage includes modeling and experimentation
for the frost formation and melting processes. The key
sub-specialties to which the book are aimed include refrigeration
system analysis and design, coupled heat and mass transfer, and
phase-change processes.
This Handbook provides researchers, faculty, design engineers in
industrial R&D, and practicing engineers in the field concise
treatments of advanced and more-recently established topics in
thermal science and engineering, with an important emphasis on
micro- and nanosystems, not covered in earlier references on
applied thermal science, heat transfer or relevant aspects of
mechanical/chemical engineering. Major sections address new
developments in heat transfer, transport phenomena, single- and
multiphase flows with energy transfer, thermal-bioengineering,
thermal radiation, combined mode heat transfer, coupled heat and
mass transfer, and energy systems. Energy transport at the
macro-scale and micro/nano-scales is also included. The
internationally recognized team of authors adopt a consistent and
systematic approach and writing style, including ample cross
reference among topics, offering readers a user-friendly
knowledgebase greater than the sum of its parts, perfect for
frequent consultation. The Handbook of Thermal Science and
Engineering is ideal for academic and professional readers in the
traditional and emerging areas of mechanical engineering, chemical
engineering, aerospace engineering, bioengineering, electronics
fabrication, energy, and manufacturing concerned with the influence
thermal phenomena.
This book elucidates heat transfer behavior for boiling of dilute
emulsions- mixtures of two immiscible fluids- which has received
little attention to date. Of the work completed in this area, the
majority has been focused on pool boiling where no mean flow is
present, and this book is the first major work to be published
regarding flow boiling of emulsions. The book includes a
comprehensive review and assessment of research on emulsion-based
heat transfer. Recent experiments are reported and analyzed to
characterize heat transfer in microgap flow boiling via a
systematic investigation into the effects of gap size, mass flux,
and volume fraction on the heat transfer coefficient and pressure
drop. The emulsion used in all experiments comprises droplets of an
immiscible electronics cooling fluid suspended in water. The volume
provides a complete baseline for flow boiling of water in the
microgaps, enabling a determination of the enhancement of the heat
transfer coefficient when the disperse component is present.
Moreover, a subset of the data set pertains to flow boiling of
dilute emulsions over microporous surfaces. The flow conditions for
which the microporous surfaces enhance or degrade heat transfer are
presented. Finally, this book provides a discussion of the physical
phenomena which affect boiling and a set of nondimensional numbers
that can be used for correlation.
This Handbook provides researchers, faculty, design engineers in
industrial R&D, and practicing engineers in the field concise
treatments of advanced and more-recently established topics in
thermal science and engineering, with an important emphasis on
micro- and nanosystems, not covered in earlier references on
applied thermal science, heat transfer or relevant aspects of
mechanical/chemical engineering. Major sections address new
developments in heat transfer, transport phenomena, single- and
multiphase flows with energy transfer, thermal-bioengineering,
thermal radiation, combined mode heat transfer, coupled heat and
mass transfer, and energy systems. Energy transport at the
macro-scale and micro/nano-scales is also included. The
internationally recognized team of authors adopt a consistent and
systematic approach and writing style, including ample cross
reference among topics, offering readers a user-friendly
knowledgebase greater than the sum of its parts, perfect for
frequent consultation. The Handbook of Thermal Science and
Engineering is ideal for academic and professional readers in the
traditional and emerging areas of mechanical engineering, chemical
engineering, aerospace engineering, bioengineering, electronics
fabrication, energy, and manufacturing concerned with the influence
thermal phenomena.
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