A plate-fin heat exchanger is a type of heat exchanger widely used in air conditioners, and tubes and fins are tightly assembled by the mechanical expansion process of tubes. The tube expansion process deforms the grooves inside the tube, and the groove shapes also affect the adhesion between tubes and fins. In this study, the adhesion and heat transfer performance affected by the tube expansio...

background and aims. the aim of this study was to assess the opening torque of grooved and non-grooved screws made of shape memory alloys (sma) for fixation of mandibular fractures. materials and methods. in this in vitro study the opening torques of ten sma screws with grooves and ten sma screws without grooves were compared in 20 holes (10 holes for grooved screws and 10 holes for non-grooved...

Secondary surface texture is of great significance to morphological variety and further expands the application areas of electrospun nanofibers. This paper presents the possibility of directly electrospinning grooved polystyrene (PS) fibers using both single and binary solvent systems. Solvents were classified as low boiling point solvent (LBPS): dichloromethane (DCM), acetone (ACE), and tetrah...

Grooved terrain is subdivided on the basis of pervasive morphology into (!) groove lanes elongate parallel groove bands, (2) grooved polygons polygonal domains ofparallel grooves, (3) reticulate rrain polygonal domains of orthogonal grooves, and (4) complex grooved terrain polygons with several complexly cross-cutting groove sets. Detailed geologic mapping ofselect areas, employing previously e...

In this study, we have successfully fabricated electrospun polystyrene (PS) nanofibers having a diameter of 326 ± 50 nm with a parallel grooved texture using a mixed solvent of tetrahydrofuran (THF) and N,N-dimethylformamide (DMF). We discovered that solvent system, solution concentration, and relative humidity were the three key factors to the formation of grooved texture and the diameter of n...

The effect of an artificially-enhanced rough surface on the secondary electron emission yield (SEY) was investigated both theoretically and experimentally. Analytical studies on triangular and rectangular grooved surfaces show the connection between the characteristic parameters of a given geometry to the SEY reduction. The effect of a strong magnetic field is also discussed. SEY of grooved sam...

Introduction: Two thirds of the surface of Ganymede is covered by grooved terrain, suggesting an active history of extensional tectonics. One important piece of Ganymede geological history is to determine the order in which groove-forming events happened. Separating grooves into a time sequence will help to constrain the geological events that formed the grooves. Previous investigations into th...

High-resolution Galileo images of grooved terrain on GanGrooved terrain covers over half of Ganymede’s surface ymede have revealed details of the morphology of grooves and their stratigraphic relationships. Based on lower resolution and records a period of intense surface deformation at Voyager images, complex areas of grooved terrain in Uruk some point in the satellite’s history. Ganymede’s ne...

Through a simple analytical description we quantify how pressure-driven flows over grooved surfaces develop transverse components, which, for shallow grooves, can be modeled with simple anisotropic effective boundary conditions. Helical recirculation results in channels or capillaries with grooved walls. An experimental validation of our model is presented. Our analysis provides a workable guid...

Two-dimensional Navier-Stokes simulations of heat and momentum transport in an intermittently grooved passage are performed using the spectral element technique for the Reynolds number range 600<Re<1800. The computational domain has seven contiguous transverse grooves cut symmetrically into opposite walls, followed by a flat section with the same length. Periodic inflow/outflow boundary conditi...