A. T. Conlisk

An experimental study of electro-osmotic flow in rectangular microchannels

Experimental studies were carried out on fully developed and steady electro-osmotic flow in a rectangular channel where the channel height

Modern helicopter rotor aerodynamics

h

Analytical solutions for the heat and mass transfer in a falling film absorber

is comparable to its width and the thickness of the electric double layer characterized by the Debye length is much less than

Electro-osmotic flow in two-dimensional charged micro- and nanochannels

h

The effect of interaction on the boundary layer induced by a convected rectilinear vortex

. The nano-particle image velocimetry technique was used to measure the two components of the velocity field parallel to and within about 100 nm of the channel wall for

Modeling of vortex‐corner interaction using point vortices

h\,{\leq}\,25\,\umu

Model for rotor tip vortex-airframe interaction. II - Comparison with experiment

m. The mobility of the particle tracers was calculated from averaged velocity data for various electric field strengths. The experimentally determined mobility values are compared with analytical predictions for dilute aqueous solutions of sodium tetraborate.

Characterizing the surface charge of synthetic nanomembranes by the streaming potential method

Abstract The helicopter rotor wake is among the most complex fluid dynamic structures being three dimensional and in many cases unsteady. The wake begins at the blade(s) where the flow can be transonic near the blade tip and undergo compressible dynamic stall. Farther down in the wake, the flow is essentially incompressible. Moreover, the rotor blades undergo complex unsteady motions because of the necessity to balance moments; they are elastic as well. In this paper, the fundamental aeromechanics of the wake and the flow on the blade is discussed and the primary methods of analysis, computation, and experiment employed to uncover the physics of the rotor wake are described.

Effect of nonuniform surface potential on electroosmotic flow at large applied electric field strength

Abstract In this paper, fully analytical solutions for the temperature and mass fraction are obtained for a falling film absorber in an absorption heat pump. The analytical solutions described here lead to an analytical expression for the local and total mass absorbed. This situation is due to the fact that the vast majority of mass transfer takes place in a thin layer near the liquid-vapor interface and that the temperature distribution is conduction-dominated. A design procedure based on the analytical solutions is developed and results for a libr-water solution are compared with recent experiments and previous numerical solutions for the temperature and the agreement with each is found to be very good. Heat and mass transfer coefficients are outputs of the problem and it is shown that the heat transfer coefficient increases with decreasing film thickness, whereas the mass transfer coefficient decreases. This situation makes it difficult to evaluate design procedures based solely on increasing heat transfer coefficients gleaned from experiments or the open literature. It is shown that for given inlet bulk temperature, solutions may be obtained only for a limited range of mass fraction.

The boundary-layer flow due to a vortex approaching a cylinder

In this work the electro-osmotic flow in a rectangular channel such that the channel height is comparable to its width is examined. Almost all previous work on the electro-osmotic flow in a channel has been for the case where the channel width is much greater than the channel height and the flow is essentially one-dimensional and depends only on channel height. We consider a mixture of water or another neutral solvent and a salt compound such as sodium chloride for which the ionic species are entirely dissociated. Results are produced for the case where the channel height is much greater than the electric double layer (EDL) (microchannel) and for the case where the channel height is of the order of the width of the EDL (nanochannel). Both symmetric and asymmetric velocity, potential and mole fraction distributions are considered, unlike previous work on this problem. In the symmetric case where all quantities are symmetric about the centreline, the velocity field and the potential are identical as in the parallel-plate one-dimensional case. In the asymmetric case corresponding to different wall potentials, the velocity and potential can be vastly different and reversed flow can occur. The results indicate that the Debye layer thickness is not a good measure of the actual width of the electric double layer. The binary results are shown to compare well with experiment and asymptotic solutions are also obtained for the case of a three-component mixture which may be applied to biomolecular transport.