دانلود مقاله مروری بر فناوری خشک کردن پاششی Spray Drying Technology Review
در این مقاله 46 صفحه ای، مروری بر تحقیقات قبلی دربارۀ فناوری خشک کردن به روش اسپری انجام گرفته و نتایج تحقیقات قبلی تشریح شده است.
This article reviews spray drying technology for possible space applications like
processing of concentrated brines that are produced in evaporation/concentration
equipment with a goal of maximum water recovery. Spray drying principles of convection,
radiation and mixed convection-radiation are reviewed. Dryer designs and performance are
reviewed. Subjects of system dynamics and controls are discussed. Adaptations of existing
spray drying concepts to microgravity environment are suggested. Guidelines for design of
the spray drying systems for space applications are proposed.
دانلود مقاله خلاصه ای تاریخی از جدیدترین پیشرفتهای دینامیک سیالات تئوری و تجربی Brief History of the Early Development of Theoretical and Experimental Fluid Dynamics
Introduction 1
2 Early Greek Science: Aristotle and Archimedes 2
3 DA Vinci’s Fluid Dynamics 2
4 The Velocity-Squared Law 3
5 Newton and the Sine-Squared Law 5
6 Daniel Bernoulli and the Pressure-Velocity
Concept 7
7 Henri Pitot and the Invention of the Pitot Tube 9
8 The High Noon of Eighteenth Century Fluid
Dynamics – Leonhard Euler and the Governing
Equations of Inviscid Fluid Motion 10
9 Inclusion of Friction in Theoretical Fluid
Dynamics: the Works of Navier and Stokes 11
10 Osborne Reynolds: Understanding Turbulent
Flow 14
11 The Circulation Theory of Lift: Kutta and
Joukowski 17
12 Ludwig Prandtl and His Boundary-Layer Theory 19
13 Summary 21
References 22
دانلود مقاله سلولهای خورشیدی باند متوسط : پیشرفتهای اخیر و جهتگیری های آینده Intermediate band solar cells: Recent progress and future directions
Extensive literature and publications on intermediate band solar cells (IBSCs) are reviewed. A
detailed discussion is given on the thermodynamics of solar energy conversion in IBSCs, the device
physics, and the carrier dynamics processes with a particular emphasis on the two-step inter-subband
absorption/recombination processes that are of paramount importance in a successful implementation
high-efficiency IBSC. The experimental solar cell performance is further discussed, which has been
recently demonstrated by using highly mismatched alloys and high-density quantum dot arrays and
superlattice. IBSCs having widely different structures, materials, and spectral responses are also
covered, as is the optimization of device parameters to achieve maximum performance.
دانلود مقاله دینامیک سیالات-زیستی قلب مصنوعی BIOFLUID DYNAMICS OF THE ARTIFICIAL HEART
The heart pumps blood to the human body. Artificial hearts are implanted in patients suffering from severe heart diseases. For the artificial heart system, we need to consider body fluids such as: Blood, intracellular fluids, extra cellular fluids, intravenous fluids and artificial (synthetic) blood. The use of anticoagulants (Heparin or Coumarin) is necessary in the implantation of an artificial organ. These act as blood thinners and prevent thromboembolism. Cardiovascular biomaterials are used to develop artificial heart valves, mechanical heart valves, pacemakers, vascular grafts, oxygenerators and cardiac assist systems (medical devices) like total artificial hearts, intra-aortic balloon pumps etc. Some of the biomaterials used in medicine are metals, polymers ceramics and hydrogels.
دانلود مقاله مروری بر فناوری روتور موجی و کاربردهای آن A Review of Wave Rotor Technology and Its Applications
The objective of this paper is to provide a succinct review of past and current research in
developing wave rotor technology. This technology has shown unique capabilities to
enhance the performance and operating characteristics of a variety of engines and machinery
utilizing thermodynamic cycles. Although there have been a variety of applications
in the past, this technology is not yet widely used and is barely known to engineers.
Here, an attempt is made to summarize both the previously reported work in the literature
and ongoing efforts around the world. The paper covers a wide range of wave rotor
applications including the early attempts to use wave rotors, its successful commercialization
as superchargers for car engines, research on gas turbine topping, and other
developments. The review also pays close attention to more recent efforts: utilization of
such devices in pressure-gain combustors, ultra-micro gas turbines, and water refrigeration
systems, highlighting possible further efforts on this topic. Observations and lessons
learnt from experimental studies, numerical simulations, analytical approaches, and
other design and analysis tools are presented. DOI: 10.1115/1.2204628