Papers

Journal of Ultra Scientist of Physical Sciences - B
Voulume: 29
Issue: 7
Article No. 1
Heat and Mass transfer on Unsteady MHD Oscillatory flow of Blood through porous arteriole with Hall effects
KAMBOJI JYOTHI
Department of Mathematics, Rayalaseema University, Kurnool, Andhra Pradesh (India)
M. VEERA KRISHNA (veerakrishna_maths@yahoo.com)
Department of Mathematics, Rayalaseema University, Kurnool, Andhra Pradesh (India)
Abstract :

We considered the MHD oscillatory flow of blood in a porous arteriole under the influence of uniform transverse magnetic field in a parallel plate channel taking hall current into account. Heat and mass transfer during arterial blood flow through porous medium are also studied. A mathematical model is developed for unsteady state situations using slip conditions. The unsteady hydromagnetic equations are solved by using regular perturbation method. Analytical expressions for the velocity, temperature and concentration profiles, wall shear stress, rates of heat and mass transfer and volumetric flow rate have been obtained and computationally discussed with respect to the non-dimensional parameters

Keyword : Heat transfer, mass transfer, chemical reaction, oscillatory flow, blood flow, hall current effect, Subject Classification codes: 80A20, 76Sxx, 76N20
Paper Download Count : 468
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Article No. 2
Thermal Conductivity of Nanoscale Materials: A Review
RICHA SAINI (kushwaha.richa@yahoo.in)
Department of Physics, Gurukul Kangri University Haridwar, Uttarakhand, India
ANKITA RANI CHAUHAN (acchauhan10@gmail.com)
Department of Physics, Gurukul Kangri University Haridwar, Uttarakhand, India
Abstract :

Nanoscale materials are being widely used in science and technology. Rapid development in synthesis and fabrication of Nanoscale materials has created a great demand for scientific understanding of thermal conductivity in nanoscale materials. The thermal conductivity in low dimensional has been obtained by using different theoretical and numerical approaches. The low dimensional structures such as quantum well, wires and dots confined in extremely small region and have novel transport properties. Measurement methods e.g. reducing grain size, multiple Phonon scattering, BTE in 2D nanoribbons, source of coherent Phonons etc open new way for nanoscale thermal transport study. This review summarizes the development in experiments, theory and computation that have occurred in thermal transport of nanoscale materials.

Keyword : Nanoscale materials, Thermal conductivity, Quantum well, Quantum wires
Paper Download Count : 378
View Count : 621
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Article No. 3
Study of dielectric relaxation mechanism and thermodynamic parameters of binary mixtures of N-methylformamide and dimethylsulphoxide in dilute solution of benzene
AJAY KUMAR SINGH (aksnmr@gmail.com)
Department of Physics, Bareilly College, Bareilly, 243005 (India)
Abstract :

Present communication reports the experimental values of the dielectric relaxation time () and dipole moment () of binary mixtures of N-methylformamide (NMF) and dimethylsulphoxid (DMSO) in dilute solution of benzene at wavelength 3.13 cm in the microwave region. The measurements have been made at 293, 303,313 and 323 K, in order to calculate the free energy of activation for dipole orientation process (F). The experimental values of t have been correlated with the calculated value of t obtained using different theories of dielectric relaxation time (  ) for mixtures. It is concluded from this comparative study that both the values are comparable to each other. Thermo dynamical parameters like molar free energy of activation (F), molar enthalpy of activation (H) and molar entropy of activation (S) have been evaluated by considering the relaxation as the rate
process.

Keyword : Dielectric relaxation time, molar free energy of activation, molar enthalpy of activation, molar entropy of activation
Paper Download Count : 421
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Article No. 4
On the Solar Forcing of Rainfall Variations in India During an Extreme Sunspot Cycle
S. AMBILY
Department of Physics,University College,Trivandrum 695034 (India)
V. G. HARITHA
Department of Physics,University College,Trivandrum 695034 (India)
C. SUNIL KUMAR MORAIS
PhD. Research scholar (external C), M.S University, Tirunelveli (India)
T.E. GIRISH (tegirish5@yahoo.co.in)
Department of Physics,University College,Trivandrum 695034 (India)
Abstract :

Solar influence on weather phenomena like Indian rainfall variations is well documented in literature. Solar activity shows significant cycle to cycle variability and it is observed to be maximum during the 19th sunspot cycle period (1954-64) when we consider direct sunspot observations during the past 315 years. It will be important and interesting to know what part of rainfall variability in India is associated with solar activity changes when we take in to account other influences such as El Nino. Since solar as signal to noise ratio on weather is expected to be maximum during the extreme "sunspot cycle 19" we have separated the All India rainfall data published by IMD in to seasons and months to study its associations with corresponding sunspot number variations. Solar forcing of rainfall variations in India is observed with weak to moderate statistical significance for the months of May, July, September, November and December in this sunspot cycle. Summer monsoon rainfall in India is found to be almost normal during the entire period of this exceptional solar cycle possibly due to significantly enhanced solar radiative forcing as evident from Solar 10.7cm radio flux variations.

Keyword : Solar forcing, All India rainfall-Sunspot activity-19th Solar cycle
Paper Download Count : 406
View Count : 519
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