Bernardo Figueroa

Bernardo Figueroa
Universidad Nacional Autónoma de México | UNAM · Institute of Engineering, LIPC

Dr

About

40
Publications
8,344
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
376
Citations
Additional affiliations
January 2008 - December 2011
Universidad Nacional Autónoma de México

Publications

Publications (40)
Article
Remote sensing-based evapotranspiration (ET) products have been evaluated primarily using data from northern middle latitudes; therefore, little is known about their performance at low latitudes. To address this bias, an evaluation dataset was compiled using eddy covariance data from 40 sites between latitudes 30° S and 30° N. The flux data were ob...
Article
Full-text available
The study of forest hydrology and its relationships with climate requires accurate estimates of water inputs, outputs, and changes in reservoirs. Evapotranspiration is frequently the least studied component when addressing the water cycle; thus, it is important to obtain direct measurements of evaporation and transpiration. This study measured tran...
Article
Full-text available
Tropical forests are among the most threatened ecosystems despite their important role in the global carbon and water cycles. In Mexico, the Yucatan Peninsula (YP) hosts near to 30% of these ecosystems. We established an ecohydrological monitoring site in a relatively pristine tropical dry forest (TDF) within “El Palmar” state reserve at the northw...
Article
Full-text available
Experiments were performed using visual and PIV techniques in order to study the appearance of a negative wake as well as its influence upon the deformation and breakup of droplets rising in viscoelastic fluids. In this report, Newtonian and viscoelastic drops were injected through different viscoelastic fluids; the deformation of the droplets was...
Article
Full-text available
Friction velocity (u*) is an important velocity scale used in the study of engineering and geophysical flows. The widespread use of 2D sonic anemometers in modern meteorological stations makes the estimation of u* from just the horizontal components of the velocity a very attractive possibility. The presence of different wind regimes (such as sea b...
Article
Full-text available
Biomass burning (BB) emissions and African dust (AD) are often associated with poor regional air quality, particularly in the tropics. The Yucatan Peninsula is a fairly pristine site due to predominant trade winds, but occasionally BB and AD plumes severely degrade its air quality. The African Dust And Biomass Burning Over Yucatan (ADABBOY) project...
Article
Full-text available
Most precipitation from deep clouds over the continents and in the intertropical convergence zone is strongly influenced by the presence of ice crystals whose formation requires the presence of ice nucleating particles (INPs). Although there are a large number of INP sources, the ice nucleating abilities of aerosol particles originating from oceans...
Article
Full-text available
The performance and flow around an oscillating foil device for current energy extraction (a wingmill) was studied through numerical simulations. OpenFOAM was used in order to study the two-dimensional (2D) flow around a wingmill. A closed loop control law was coded in order to follow a reference angle of attack. The objective of this control law is...
Preprint
Full-text available
Most precipitation from deep clouds over the continents and in the intertropical convergence zone is strongly influenced by the presence of ice crystals, whose formation requires the presence of ice nucleating particles (INP). Although there are a large number of INP sources, the ice nucleating abilities of aerosol particles emitted from oceans, de...
Article
Full-text available
Atmospheric aerosol particles that can nucleate ice are referred to as ice-nucleating particles (INPs). Recent studies have confirmed that aerosol particles emitted by the oceans can act as INPs. This very relevant information can be included in climate and weather models to predict the formation of ice in clouds, given that most of them do not con...
Article
Full-text available
RESUMEN El dióxido de carbono (CO 2) es uno de los principales gases de efecto invernadero (GEI) cuyo incremento en la atmósfera está asociado con el calentamiento global. Con el objetivo de promover estudios de síntesis que lleven a un mejor entendimiento de los procesos relacionados con el ciclo del carbono en ecosistemas terrestres y costeros de...
Article
The hydrology and productivity of the ecosystems of the Yucatan Peninsula (YP) are highly constrained by two factors: 1) the lack of surface drainage networks due to the existence of a highly permeable and connected karstic aquifer roughly the size of the peninsula, and; 2) a climatic gradient that leads to a transition from seasonally‐dry deciduou...
Article
A nearly monodispersed bubbly flow in a Hele–Shaw type channel was studied, for large but finite Reynolds numbers. Experiments were carried out with millimetre-sized Nitrogen bubbles rising through water-glycerin mixtures.The velocities, geometry and other flow characteristics were measured by means of a high speed camera and an image processing ro...
Article
Full-text available
A field experiment was conducted on the northern Yucatan coast from April 1 to April 12, 2014 to investigate the role of intese wind events on coastal circulation from the inner shelf to the swash zone. The study area is characterized by a micro-tidal environment, low-energy wave conditions, and a wide and shallow continental shelf. Furthermore, ea...
Chapter
Full-text available
Wind related research, carried out in the Laboratorio de Ingeniería y Procesos Costeros del Instituto de Ingeniería de la UNAM (LIPC) at Sisal, Yucatán is revisited. Some experimental results, obtained with a 50 m meteorological mast equipped with sonic anemometers (between 2010 and 2016) are discussed, along with some unpublished results and LIDAR...
Article
The motion of particles in a solid-liquid fluidized bed was experimentally studied by video tracking of marked particles in a matched refractive index medium. In this study, two fluidized states are compared, one carefully aligned in the vertical direction ensuring a homogeneous fluidisation and another one with a non-homogeneous fluidisation regim...
Article
The deformation of viscoelastic droplets rising in non-Newtonian fluids is examined experimentally. Similarly to the case of bubbles and Newtonian droplets traveling in viscoelastic fluids, a critical volume exists but there is no jump in velocity nor a drastic change in droplet geometry. Nevertheless, a tail appears as well as a negative wake. For...
Article
Full-text available
We investigate the wave energy potential in the Caribbean Sea using a 30-year wave hindcast. Wave energy in enclosed sea basins, such as the Gulf of Mexico and the Caribbean Sea, is commonly associated with lower energy production rates. However, an easterly zonal wind reaching 13 m/s, known as the Caribbean Low-Level Jet (CCLJ), is shown to contro...
Article
Full-text available
Copyright (2015) AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in (Esquivelzeta-Rabell, F. M. et al. Physics of Fluids (1994-present), 27(1), 014108.) and may be found at (http://dx.doi.org/10.1063/1.4906153). Laminar Co...
Poster
Full-text available
A comprehensive field experiment devoted to the study of coastal processes on a micro-tidal beach was conducted from March 30th to April 12th 2014 in Sisal, Yucatán México. Wave conditions in the study area are controlled by local (i.e., sea-breezes) and meso-scale (i.e., Nortes) meteorological events. Simultaneous measurements of waves, tides, win...
Article
Full-text available
The symmetry of Taylor bubbles moving in a vertical pipe is likely to break when the liquid flows downward at a velocity greater than some critical value. The present experiments performed in the inertial regime for Reynolds numbers in the range 100<Re<10000 show that bifurcation to an eccentric motion occurs, with a noticeable increase of the bubb...
Article
Experimental results concerning turbulence in a coastal zone are presented. The presence of internal boundary layers and advection in complex terrain precludes the use of Monin–Obukhov similarity theory (MOST) to estimate effective values of the turbulent transport (of momentum and heat) parameters. However, the use of local Monin–Obukhov similarit...
Article
Full-text available
Wind power density, vertical velocity profiles, and other wind characteristics were established using a 51 m meteorological mast located very close to the shoreline on the northwest of the Yucatan peninsula in the Gulf of Mexico. A comparative study of the wind power density was carried out using information obtained between September 2010 and Sept...
Chapter
The random motion of mono-dispersed particles in a liquid fluidized bed was measured and processed from video recordings, using a refractive index matching method. 3D trajectories of coloured particles have been collected in a wide range of solid fraction, and statistical quantities have been derived in the range of high particle Reynolds number (O...
Article
Full-text available
The velocity and shape of Taylor bubbles moving in a vertical channel in a Poiseuille liquid flow were studied for the inertial regime, characterized by large Reynolds numbers. Numerical experiments were carried out for positive (upward) and negative (downward) liquid mean velocity. Previous investigations in tube have reported that for upward flow...
Article
Mass transfer was studied for the case of a spheroidal bubble rising through a stationary liquid. A numerical code that solves the Navier–Stokes equations and the diffusion–advection equation for the concentration was used to characterize the transfer from the bubble to the surrounding liquid phase. Simulations were carried over systematically for...
Conference Paper
Full-text available
The motion of Taylor bubbles in the interior of pipes or channels has been investigated numerically and experimentally. The physical experiments were carried out in vertical pipes of various diameters and liquids of various viscosity so as to investigate both laminar and turbulent regimes. A symmetry breaking bifurcation that affects the bubble dyn...
Article
The effect of confining a gas bubble between two parallel walls was investigated for the inertia-dominated regime characterized by high Reynolds and low Weber numbers. Single bubble experiments were performed with non-polar liquids such that the bubble surface could be considered clean; hence, shear free. The drag coefficient was found to be the re...
Conference Paper
The motion of Taylor-bubbles that rise in the interior of pipes was studied numerically for the particular situation where the slugs rise while facing a (downwards) liquid velocity profile upstream the bubble nose. Two types of simulations were implemented during this study: first the mean velocity was set to a constant value, so Taylor bubbles ev...
Article
In nature, as well as in many engineering applications, the effects of confining walls on bubbly flows play an important role. Problems of practical interest where this situation occurs are such as underground water wells and naturally fractured oil reservoirs. Most fundamental studies do not include the effects of walls. The confinement effect on...
Article
Experiments were conducted to determine the amount of clustering that occurs in bubbly flows for which the liquid motion can be described, with a certain degree of accuracy, using potential flow theory. A Hele-Shaw-type channel was used in which bubble overlap was avoided. Direct video image analysis was performed to calculate bubbles properties an...
Article
We are conducting experiments to determine the amount of clustering that occurs when small gas bubbles ascend in clean water. In particular, we are interested in flows for which the liquid motion around the bubbles can be described, with a certain degree of accuracy, using potential flow theory. This model is applicable for the case of bubbly liqui...

Network

Cited By

Projects

Projects (2)
Project
The main goals are i) to calculate the concentration of ice nucleating particles (INPs), ii) to identify the main source of INPs in the remote coastal region of Sisal, iii) to estimate the importance of the long range transport of aerosol particles into the Gulf of Mexico
Project
The National Coastal Resilience Laboratory (LANRESC) constitutes a platform to conduct interdisciplinary and multi-institutional research projects focused on the effects that physical processes have on the coastal areas of Mexico, Central America and the Caribbean. The objective of the LANRESC is to investigate the coastal systems and their associated resilience to different types of perturbations (i.e., natural or anthropogenic) including extreme events, coastal development and climate change. The LANRESC conducts both basic and applied research with a holistic and interdisciplinary approach, by the participation of researchers from different areas and disciplines relevant to the coast. The studies will employ field observations, remote-sensing techniques, physical modeling, and numerical modeling in order to characterize present and future scenarios associated to different types of perturbations. The LANRESC studies will make possible to assess the environmental and socio-economical impacts in the coastal zone. Furthermore, a great effort will be devoted to the connection with the different sectors of society by organizing workshops and other reach-out activities in order to contribute to the solution of coastal-related problems throughout providing information that could be employed by policy makers.