We provide a theoretical description of the dynamics of a liquid film perturbed by a nano-object. Our analysis is based on the general dispersion relation for surface perturbations which is valid for films of arbitrary thickness. In the case of thin liquid films the lubrication approximation is retrieved. The relevant time scales are derived and related to the characteristic length scales prese...

Objective: To compare the coefficient of friction (CoF) of skin against fabric when the skin is covered with a liquid barrier film versus a silicone dressing, relative to a bare skin baseline. Approach: A laboratory instrument allowing the measurement of friction between two surfaces was used to compare the CoF between a fabric representing bed linen (100% cotton) and the skin of two laboratory...

Motivated by the development of lubricant-infused slippery surfaces, we study a sessile drop of a nonvolatile (ionic) liquid which is embedded in a slowly evaporating lubricant film (n-decane) on a horizontal, planar solid substrate. Using laser scanning confocal microscopy we imaged the evolution of the shape of the liquid/liquid and liquid/air interfaces, including the angles between them. Re...

for a paper presentation at the 12th international symposium on applications of laser techniques to fluid mechanics Investigation of film flow by means of μ-PIV P. Schober, B. Richter, O. Schäfer and K. Dullenkopf Lehrstuhl und Institut für Thermische Strömungsmaschinen (ITS) Universität Karlsruhe Germany Shear-driven liquid wall films play a major role in the fuel preparation process in state ...

A mathematical model which can be predicted the flow and heat transfer characteristics for evaporating thin film region in micro channel is presented and an analytical investigation is performed by using the presented model. For the formulation of modeling, the flow of the vapor phase and the shear stress at the liquid-vapor interface are considered. In addition, the disjoining pressure and the...

Visual observations on rates and modes of water penetration into black bean seeds and into wheat and sorghum kernels during conditioning were accomplished by an autoradiographic procedure that eliminates a freezing microtome and liquid and stripping film emulsions. Seeds soaked in tritiated H(2)O were hand sectioned before freeze-quenching in liquid N(2) and subsequent block autoradiography on ...

A liquid falling between horizontal tubes can take the form of droplets, jets, or a continuous sheet mode, depending on the flow rate. The so-called falling-film flow regime is important to heat and mass transfer, and to maintaining wetted-surface conditions in a falling-film tube bundle, and the performance of such tube bundles is important in many air-conditioning systems. In this paper, we r...