Search or add a thesis

Advanced Search (Beta)
Home > Modeling of the Nanofluids Thin Film Flow Problems over Stretching Surfaces With Analytical and Numerical Approach

Modeling of the Nanofluids Thin Film Flow Problems over Stretching Surfaces With Analytical and Numerical Approach

Thesis Info

Access Option

External Link

Author

Ullah, Asad

Program

PhD

Institute

Abdul Wali Khan University

City

Mardan

Province

KPK

Country

Pakistan

Thesis Completing Year

2020

Thesis Completion Status

Completed

Subject

Mathemaics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12446/1/Asad%20Ullah%20maths%202020%20awk%20mardan%20prr.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726658837

Similar


In this work we concentrated on the modeling of the nanofluid thin film flow past a stretching surface with different physical parameters. These parameters of interest are discussed in brief in each chapter with its physical significance with solution techniques. Chapter one is an overview of the basic definitions and models. Classification of the fluid is presented with diagrams and some different physical phenomena are sketched with figures. The basic model equations for the description of the physical system are derived with its physical significance. A comprehensive note is presented on the nanofluid model for the thermal conductivity in the enhancement of heat. Hall effect is discussed with its mathematical relation to the momentum equation. Some basic models for non-Newtonian fluids are also presented. In conclusion to this chapter, the basic scheme of the solution technique is discussed. In chapter two we focus on the literature present for the next four chapters. Nanofluids are discussed in detail and work are done on the nanofluids is described over stretching surfaces. MHD flow with Hall effect is encircled with its mechanism and literature survey. Finally the concept of boundary-layer is presented for nanofluid from its literature point of view on stretching surfaces. In chapter three, thin film flow is modeled with the help of the Reiner-Philippoff fluid model. The physical problem is sketched in the form of the mathematical model which is further transformed into an ODEs system with its boundary restrictions. The effects of Brownian motion and thermophoresis are studied over the Reiner-Philippoff fluid. The transformed model is solved by using HAM. The convergence of the implemented technique is presented in the form of tables. The impact of Nusselt number, Sherwood number and skin friction is presented over these profiles. Tables show the impact and efficiency of our implemented technique. In chapter four, different base fluids are used for viscous Titania nanofluid flow. A 3D flow of an electrically conducting fluid is considered over an inclined rotating surface. A magnetic filed id applied to the surface of the sheet. A similar approach we have used in chapter 3 is implemented. The reduced model is solved with the help of the numerical technique. The implemented technique is compared with the HAM results in the form of tables. The convergence of the technique is also presented by the graphs. The impact of different physical parameters are discussed over various state variables. In chapter five, the second grade viscoelastic MHD nanofluid flow past a vertical stretching sheet is assumed. The physical problem contains the entropy generation, mass transfer and heat transfer in the fluid flow. The gradient in concentration, thermophoresis and Brownian effects are considered in the flow. A physical problem is modeled and transformed with help of new dimensionless variables together with the boundary restrictions and is further solved with the help of HAM. The implemented technique convergence is shown by tables. The effect of various physical parameters is observed and analyzed over different profiles. In chapter six, a magnetic field is applied to a three dimensional geometry with a rotating disk over which a steady and viscous nanofluid flow is considered. The analysis of the fluid flow is carried out with consideration of the Casson fluid model. The fluid assumed to be electrically conducting. To reduce the complexity of the model, the system is transformed into less complex model by using the newly introduced dimensionless variables with its boundary restrictions. A numerical technique in comparison with HAM is used for the problem solution. Some physical important parameters are described in detail and its impact is analyzed over different state variable profiles. A comparative tabular survey for the numerical technique with HAM is presented. This tabular survey shows the reliability of our technique. Finally, in the last two chapters, the results obtained, and the papers published from this work is presented.
Loading...

Similar Thesis

Showing 1 to 20 of 100 entries
TitleAuthorSupervisorDegreeInstitute
PhD
Abdul Wali Khan University, Mardan, Pakistan
PhD
Abdul Wali Khan University, Mardan, Pakistan
Mphil
Riphah International University, Islamabad, Pakistan
PhD
COMSATS University Islamabad, Islamabad, Pakistan
PhD
Quaid-I-Azam University, Islamabad, Pakistan
MS
International Islamic University, Islamabad, Pakistan
PhD
Abdul Wali Khan University, Mardan, Pakistan
PMT
COMSATS University Islamabad, Islamabad, Pakistan
PhD
COMSATS University Islamabad, Islamabad, Pakistan
MS
COMSATS University Islamabad, Islamabad, Pakistan
PhD
Islamia Collage Peshawar, Peshawar, Pakistan
PhD
Islamia Collage Peshawar, Peshawar, Pakistan
MA
Quaid-i-Azam University, Islamabad, Pakistan
PhD
Quaid-I-Azam University, Islamabad, Pakistan
PhD
Lahore University of Management Sciences, Lahore, Pakistan
PhD
HITEC University, Taxila, Pakistan
PhD
Quaid-I-Azam University, Islamabad, Pakistan
PhD
Quaid-I-Azam University, Islamabad, Pakistan
BSM
COMSATS University Islamabad, Islamabad, Pakistan
Mphil
Quaid-i-Azam University, Islamabad, Pakistan
TitleAuthorSupervisorDegreeInstitute
Showing 1 to 20 of 100 entries

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

8۔عدالتی فیصلوں میں تاخیر

پاکستان جیسے ملک میں پولیس کی سستی اور عدم تعاون کا مرکز عمومی طور پر حدودمقدمات ہوتے ہیں ۔ پھر ان مقدمات کا دعویٰ بہت تاخیر سے دائر ہوتا ہے ۔ پھر بہت زیادہ تاخیر سے ان مقدمات کے کیس عدالتوں میں لگتے ہیں اور بآلاخر ان مقدمات کے فیصلے بھی بہت سالوں بعد ہوتے ہیں ۔اس کی بنیادی وجہ پولیس کی سستی ، رشوت کی عادات ، وکلاء کا عدم تعاون اور ججز کی تعداد کا کم ہونا ہے۔ پاکستانی معاشرہ اس وقت جرائم کا گڑھ بن چکا ہے ۔ روزاانہ کی بنیاد پر کافی زیادہ جرائم رپورٹ بھی ہوتے ہیں اور ان کی FIR بھی درج ہو تی ہیں ۔پھر یہ مقدمات عدلیہ کے سامنے پیش ہو تے ہیں ۔ اس طرح حدود وقصاص کے مقدمات سالوں تک چلتے ہیں۔ اس کے علاوہ اداروں کے آپس میں مربوط نہ ہونے کی وجہ سے حدود وقصاص کے مقدمات کو غلط طریقے سے نمٹایا جا تا ہے۔ وقت پر انصاف نہ ملنے کی وجہ سے مظلو م اور متضرر اپنے عدالتی نظام سے اور انصاف نہ ملنے پر ریاست سے بھی بد ظن ہو جاتے ہیں ۔

مکالمہ بین المذاہب شرائط، مقاصد جديد

Now the whole world is the global village. The science has brought revolution in every field of life. Man has made a lot of things for his comforts, discomforts, reliefs and destruction. Now the time has come for us to take evolutionary steps to save us from giant’s destruction, terrorism, extremism, intolerance and unrest which are the machinations of complete annihilation over the earth, which needs cosmopolitanism on our part For this purpose, dialogue can play a vital role. People belongs to different civilizations, cultures, societies, nations and religions can sit around the table beings humans and can solve religious, political, geo political and economical problems by enhancing mutuality and common understanding. Dialogical aim should be to avoid clash of civilizations and peace for everyone. Terrorism and extremism should be stopped and we should promulgate coexistence and peace for whole human community. Purpose should be to serve the humanity. We should promote love, peace, respect for the other religions; serve humanity create equality and equity among human beings. This should be safety of present and coming generation. We should pay our role as super creature and thinking creature; super. The barriers which come across while promulgating cosmopolitanism and expatriation is seemed to be is the double standard of the west, that promotes colonialism, terrorism, extremism and economical support of missionaries and these things are the real problems for those human beings who take serious trenchant and serious efforts to achieve dialogical goals cannot achieve it. The role western media plays; is not supportive to this nation. Western world especially American should use her hegemony to make world worth living and worth seeing to the coming generation.

Endocrine Disruption, Genotoxicity and Biochemical Abnormalities in Human Population Exposed Chromium in Effluents of Tanneries in Pakistan

Chromium is one of the toxic heavy metals, which is extensively discharged from tanning industry to the environment. Chromium has binding potential to biomolecules in living systems and cause toxicity to biological life. Leather industry has been categorized as one of the highly polluting industry. Tanning industry is polluting the environment at a higher rate with huge amount of harmful material. These pollutants are also harmful for environment, humans and aquatic organisms. The aim of the present study was to investigate the effects of chromium on selected endocrine hormones, oxidative stress, DNA damage, biochemical and haematological parameters of tannery workers and environmental parameters. Two major cities, Peshawar and Sheikhupura, were selected for the sampling sites. Samples of effluents, ground water, soil and vegetables were collected from the neighboring vicinity of tanning industries. The background area and adjoining villages were considered as control areas. Seven trace metals (Cr, Cu, Ni, Cd, Pb, Fe, and Zn) were investigated in tannery effluents, ground water, soil and dietary vegetables (Spinacia oleracea, Solanum tuberusom and Solanum melongena) samples using Graphite Furnace Atomic Absorption Spectrophotometer. It was observed that both soil and groundwater of study area were badly affected by the toxic elements discharged by tanning industries. The maximum level of Cr in tannery effluents was 350.15 mg/l, while in the soil sample it approached to 31.13mg/l. The values of chromium, cobalt, cadmium, lead and iron in the tannery effluents from Sheikhupura and Peshawar were above the permissible limits set by WHO (World health organization) and FAO (Food and Agriculture organization). The concentration of chromium, cadmium, nickel and lead in study area ground water from Sheikhupura and Peshawar exceeded the standards of NSDWQ/Pak (National standard for drinking water quality). Vegetables irrigated with tannery effluents showed elevated level of Cr, Zn, Ni and Cd, which were above the permissible limits of WHO/FO. There was a significant positive correlation between all the trace metals in three media, tannery effluent, soil and ground water (p<0.001). The metal to metal association was supported by dendrograms using cluster analysis. A total of 240 smoking and nonsmoking individuals were registered in the study, including 120 chromium exposed tannery workers and 120 controls. The workers were selected from the tanneries of Sheikhupura and Peshawar, Pakistan. The average age of exposure group I was 20-35 years, exposure group II was 36-50 years and controls were 20-50 years. Hormonal parameters in the blood samples were determined by commercial kit, Chemiluminescent Microparticle Immunoassay (CMIA). Oxidative stress parameters were measured in the blood samples by spectrophotometric methods. DNA damage in lymphocytes was measured by comet assay (single-cell gel electrophoresis). Blood samples were collected from different age group subjects (chromium exposed tannery workers and controls). The results revealed that both smoking and nonsmoking exposed groups showed significantly higher chromium levels in blood and urine than those of unexposed groups. The levels of testosterone (326.238± 12), (306.636±13.8) and growth hormones (0.1030±0.03), (0.0734±0.01) were significantly decreased in both age groups of male tannery workers exposed to chromium. The level of progesterone (2.416 ± 1.1), estradiol (48.879 ± 40.1), luteinizing (1.9692± 0.82) and growth hormones of female tannery workers (0.7983±0.1) were significantly decreased while follicle stimulating hormone (9.2857 ± 0.7) was significantly increased as compared to unexposed population. Thyroid stimulating hormone, triiodothyronine and tetraiodothyronine hormones were not affected in tannery workers. The hormones in tannery workers in group II aged (36-50) were more affected due to long-term Cr exposure as compared to group 1 with short term chromium exposure and controls. This was further supported by correlation and regression analyses of the data. Pearson correlation showed that the levels of sex hormones (testosterone, progesterone, estradiol and luteinizing hormone) and growth hormone had negative correlation with blood chromium concentration in tannery workers. The present study revealed that occupational exposure to Cr (VI) and Cr (III) can lead to a detectable DNA damage in tannery workers. DNA damage (28.79± 2.154), (25.41± 7.199) in smoking and nonsmoking tannery workers were significantly higher than those of unexposed groups. In addition, DNA damage was significantly associated with concentration of chromium in blood. Malondialdehyde (MDA) levels (11.00 ± 0.7), (8.77± 2.3) and superoxide dismutase (SOD) concentrations (75.178± 2.3), (79.52±1.9) of smoking and nonsmoking exposed groups were significantly higher than those of unexposed groups. While glutathione (GSH) levels (59.926 ± 1.5), (55.702 ± 2.3) in smoking and nonsmoking exposed groups were significantly lower when compared with unexposed groups. Oxidative stress parameters and DNA damage in group II tannery workers aged (36- 50) with long-term Cr exposure were more affected as compared to tannery workers in group I with short term chromium exposure and controls. This investigation was further supported by correlation analysis. There was positive correlation between levels of blood chromium and DNA damage, MDA and SOD levels, while negative correlation was observed between blood chromium concentration and GSH levels in tannery workers. The results showed that duration of exposure and smoking has significant effect on DNA damage and oxidative stress parameters in tannery workers. The present study also described biochemical and haematological defects in tannery workers exposed to hexavalent chromium. From the findings, it is evident that white blood cells (WBC) (8.373±0.7), red blood cells (RBC) (4.12±0.5), haemoglobin (Hb) (10.02±1.14), mean corpuscular haemoglobin (MCH) (25.91±1.50), and packed cell volume (PCV) (42.62±2.0) were lower in exposed groups than that of controls. The values of liver function tests of tannery workers were found to be within the normal range in both the age groups except alkaline phosphatase (AP) activity (121.28±8.3), which was significantly increased in exposed groups. All other biochemical parameters were found to be within the normal range except the albumin (Alb) levels which was significantly decreased in exposed groups. The present study found that occupational exposure to chromium can lead to health hazards including hormonal abnormalities, oxidative stress, DNA damage and hematological and biochemical defects in tannery workers.