A5102934610- Fluid Dynamics and Turbulent Flows
- Rheology and Fluid Dynamics Studies
- Blood properties and coagulation
- Infectious Diseases and Tuberculosis
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Vibration Analysis
- Musculoskeletal pain and rehabilitation
- Hematological disorders and diagnostics
- Assisted Reproductive Technology and Twin Pregnancy
- Cardiac Health and Mental Health
- Cardiovascular Issues in Pregnancy
- Spinal Fractures and Fixation Techniques
- Differential Equations and Numerical Methods
- Wind and Air Flow Studies
- Neonatal Respiratory Health Research
- Anesthesia and Pain Management
- Cardiac Structural Anomalies and Repair
- Orthopedic Infections and Treatments
- Bacterial Infections and Vaccines
- Case Reports on Hematomas
- Aerodynamics and Fluid Dynamics Research
- Pregnancy and preeclampsia studies
- Fluid Dynamics and Thin Films
- Cervical and Thoracic Myelopathy
- Spine and Intervertebral Disc Pathology
Indian Institute of Technology Kanpur
2018-2023
Jawaharlal Nehru Medical College Hospital
2000-2023
Cleveland Clinic
2023
Aligarh Muslim University
2013
Newtonian pipe flow is known to be linearly stable at all Reynolds numbers. We report, for the first time, a linear instability of pressure-driven viscoelastic fluid, obeying Oldroyd-B constitutive equation commonly used model dilute polymer solutions. The shown exist numbers significantly lower than those which transition turbulence typically observed flow. Our results qualitatively explain experimental observations in solutions rates where absent. discussed here should form stage hitherto...
Viscoelastic plane Poiseuille flow is shown to become linearly unstable in the absence of inertia, limit high elasticities, for ultradilute polymer solutions. While inertialess elastic instabilities have been predicted curvilinear shear flows, this first ever report a purely linear instability rectilinear flow. The novel continues up Reynolds number (Re) $O(1000)$, corresponding recently identified elasto-inertial turbulent state believed underlie maximum-drag-reduced regime. Thus, highly...
A purely elastic linear instability was recently reported for viscoelastic plane Poiseuille flow in the limit of ultra-dilute (solvent to solution viscosity ratio $\beta \gt 0.99$ ), highly (Weissenberg number $W \sim 1000$ ) polymer solutions, within framework Oldroyd-B model (Khalid et al. , Phys. Rev. Lett., vol. 127, 2021, pp. 134–502). This is first instance a strictly rectilinear shearing flow, with phase speed unstable ‘centre mode’ being close base-state maximum velocity at channel...
A modal stability analysis shows that plane Poiseuille flow of an Oldroyd-B fluid becomes unstable to a `center mode' with phase speed close the maximum base-flow velocity, $U_{max}$. The governing dimensionless groups are Reynolds number $Re = \rho U_{max} H/\eta$, elasticity $E \lambda \eta/(H^2\rho)$, and ratio solvent solution viscosity $\eta_s/\eta$; here, $\lambda$ is polymer relaxation time, $H$ channel half-width, $\rho$ density. For experimentally relevant values (e.g., \sim 0.1$...
The purpose of this study is to evaluate the role magnetic resonance imaging (MRI) in evaluation tubercular spondylitis and correlate findings with clinical severity disease.One hundred consecutive patients, who presented features suggestive spinal infections, were subjected MRI examination. T1W STIR images obtained followed by T2W post-contrast images. Various characteristics infections noted correlated disease.Backache was most common presenting symptom present 86 %, while paraparesis sign...
We examine the linear stability of gravity-driven flow a viscoelastic fluid film down an inclined plane. The is modeled using Oldroyd-B constitutive equation and, therefore, exhibits constant shear viscosity and positive first normal stress difference in viscometric shearing flows; latter class flows includes aforesaid film-flow configuration. show that configuration susceptible to two distinct purely elastic instabilities inertialess limit. instability owes its origin entirely existence...
Introduction: Back pain potentially associated with modic changes in lumbar spine, radiculopathy or spinal stenosis, specic cause nonspecic low back pain. Patients non-specic comprised of 85% all patients chronic Lumbar facet medial branch block can be used as one the modality for relief well diagnosis due to medic spine. To co-relate duration and degree after control Objectives: led blocks different grades spine non- Methods: The present study was prospective study. A total 75 were...
Abstract Tubercular meningitis is one of the serious manifestations tuberculosis. It remains a significant contributor to morbidity and mortality in children. Meningeal involvement tuberculosis detected by physical, chemical cytological examination cerebrospinal fluid (CSF). The picture CSF tubercular quite similar that viral showing mixed population lymphoid series cells. presence epithelioid cell cluster very rare finding. We present here such case 2½ yr old boy who presented with fever...
Background: The aim of this study is to compare the use amniotic fluid index with maximum vertical pocket for predicting perinatal outcomes.Methods: present was a prospective observational and includes 140 include normal antenatal women at gestational age 40 weeks or beyond (by last menstrual period/1st trimester scan) referred from between 20 years were enrolled in 2015 2017. After Institutional Ethics Committee approval all recruited assessed 3rd visit baseline demographic obstetric data....