Journal ArticleDOI
A pulsed-wire technique for velocity measurements in highly turbulent flows
L. J. S. Bradbury,Ian P. Castro +1 more
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The velocity measuring technique described in this article consists of measuring the time of flight of a tracer of heated air from an electrically pulsed wire to one of two sensor wires which are operated as resistance thermometers.Abstract:
The velocity measuring technique described in this paper consists of measuring the time of flight of a tracer of heated air from an electrically pulsed wire to one of two sensor wires which are operated as resistance thermometers. These sensor wires are at right angles to the pulsed wire and are placed one on either side of the pulsed wire. The instrument may be used in highly turbulent flows including regions in which flow reversals occur. The paper discusses the theoretical behaviour of the probe and the results of some calibration experiments.read more
Citations
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Journal ArticleDOI
The flow around a surface-mounted cube in uniform and turbulent streams
Ian P. Castro,A. G. Robins +1 more
TL;DR: In this article, an experimental investigation of the flow around surface mounted cubes in both uniform, irrotational and sheared, turbulent flows is described, and comparisons with the somewhat sparse measurements of previous workers are made and the relevance of recent theoretical attempts to describe the flow, as opposed to numerical calculation techniques to predict it, is briefly discussed.
Journal ArticleDOI
Pedestrian-level wind conditions around buildings: Review of wind-tunnel and CFD techniques and their accuracy for wind comfort assessment
TL;DR: In this paper, a comparative study of wind-tunnel and CFD techniques to determine pedestrian-level wind speeds expressed generally in terms of amplification factors defined as the ratio of local mean wind speeds to mean wind speed at the same position without buildings present is presented.
Journal ArticleDOI
An experimental investigation of a turbulent shear flow with separation, reverse flow, and reattachment
R. Ruderich,H. H. Fernholz +1 more
TL;DR: In this paper, the authors measured mean velocity, Reynolds-shear-stress and Reynolds-normal-stress distributions of highly turbulent and disturbed flow over a bluff plate with a long splitter plate in its plane of symmetry.
Journal ArticleDOI
Air flow over a two-dimensional hill: studies of velocity speed-up, roughness effects and turbulence
TL;DR: In this article, the authors show that the shear stresses are only important in an inner region close to the hill surface, so that, as suggested by Jackson and Hunt (1975), the perturbation to the mean flow outside this region is essentially inviscid.
Journal ArticleDOI
The structure of a turbulent shear layer bounding a separation region
Ian P. Castro,A. Haque +1 more
TL;DR: In this article, the authors used pulsed-wire anemometry to measure the Reynolds number in the separated shear layer behind a flat plate normal to an airflow, showing that the normal stresses all rise monotonically as reattachment is approached, are always considerably higher than the plane layer values and develop in quite different ways.
References
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Journal ArticleDOI
Two-dimensional convection from heated wires at low Reynolds numbers
Collis Dc,Williams Mj +1 more
TL;DR: In this article, the theoretical heat transfer relation based on the Oseen approximation is approached asymptotically as R → 0, provided free convection is negligible, which is the case when the Reynolds number is less than the cube root of the Grashof number.
Journal ArticleDOI
Wake characteristics of two-dimensional perforated plates normal to an air-stream
TL;DR: In this article, the flow in the wakes behind two-dimensional perforated plates has been investigated in the Reynolds number range 2·5 × 104 to 9·0 × 104 and the results indicate the existence of two distinct types of flows: one appropriate to high and the other to low values of plate porosity.
Journal ArticleDOI
Some comments on heat-transfer laws for fine wires
L. J. S. Bradbury,Ian P. Castro +1 more
TL;DR: The semi-empirical heat transfer laws of Collis & Williams (1959) and Davies & Fisher (1964) give values of the heat-transfer rates for the flow past fine wires which are generally very different from one another as discussed by the authors.
Book
Velocity Measurement with a New Probe in Inhomogeneous Turbulent Jets
TL;DR: In this paper, a velocity measuring probe was used to measure the time interval between the time a pulse is created and the time at which it is convected by the flow past a sensing wire a short distance downstream.
Related Papers (5)
An experimental investigation of a turbulent shear flow with separation, reverse flow, and reattachment
R. Ruderich,H. H. Fernholz +1 more