Journal of Naval Architecture and Marine Engineering <p>An International Research Publication by the Association of Naval Architects and Marine Engineers. Full text articles available. 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Mashud Karim) (Md Fahmid Uddin Khondoker) Wed, 29 Jun 2022 17:41:44 +0000 OJS 60 Combined convective and viscous dissipation effects on peristaltic flow of Ellis fluid in non uniform tube <p><strong>Abstract:</strong></p> <p><em>This paper investigates the peristaltic transport of Ellis fluid in a non-uniform tube with combined/individual effects of convective and viscous dissipation analytically. Low Reynolds number and long-wavelength approximation assumptions are considered in the analysis. An examination of the properties of the walls is also carried out. The expressions for velocity, temperature profile, and stream function are obtained subjected to convective boundary conditions. The peristaltic transport's significant characteristics are delineated with plots for various Ellis fluid parameter values. The viscous dissipation effects are found to be related to the Brinkman number, so it leads to rising fluid temperature in all cases.</em></p> Mahadev M Channakote, V. Dilipkumar Kalse Copyright (c) 2022 Journal of Naval Architecture and Marine Engineering Wed, 29 Jun 2022 00:00:00 +0000 Inventory optimization model of deteriorating items with nonlinear ramped type demand function <p>Inventory models for deteriorating items of a supply chain is of critical essence to the maritime industry. This study proposes a real and economically efficient multicriteria inventory policy of inventory models for deteriorating items of a supply chain with nonlinear ramp functions and permissible delay in payment under inflation, two conditions Shortages Followed by Inventory (SFI) and Inventory Followed by Shortages (IFS) have been considered for the formulation of models. Both the models consist of ordering cost, unit cost, deterioration cost, shortage cost and holding cost with replenishment where delay in payments is allowed. The development of these models is to minimize the total average cost per unit time. In order to validate the models, numerical examples have been considered and the sensitivity of several major parameters of exponential and quadratic functions is analyzed. From the numerical result, it is clear that the cost per unit time of IFS model decreases with the increment of the values of parameters of the quadratic function and holding cost whereas, with the increment of the values of parameters of the exponential function as well as holding cost per unite time, the cost per unit time of SFI model decreases. However, if the values of the parameters of the exponential functions as well as ordering cost and shortage cost increase, the cost per unit time of IFS model increases. On the other hand, it will also increase considering SFI condition, if the values of parameters of the quadratic function as well as ordering cost and shortage cost increase. Finally, it is observed that the model considering IFS case works better than SFI model up to a certain level.&nbsp;</p> <p>&nbsp;</p> Kife I. Bin Iqbal, Akbar Rafique , Mohammed Forhad Uddin Copyright (c) 2022 Journal of Naval Architecture and Marine Engineering Wed, 29 Jun 2022 00:00:00 +0000 The Buongiorno model with Brownian and thermophoretic diffusion for MHD casson nanofluid over an inclined porous surface <p>The key goal of the study under concern is to test the effects of Brownian movement and thermophoresis dispersion on MHD Casson nanofluid limit layer stream over a nonlinear slanted permeable extending surface, with the impact of convective limits and warm radiation with synthetic response. Nonlinear ODEs are gotten from overseeing nonlinear PDEs by utilizing good comparability changes. The amounts related with building angles, for example, skin grating, Nusselt number and Sherwood number alongside different effects of material factors on the speed, temperature, and focus, are explained and explained with outlines. The numerical consequences of the current investigation are acquired through the Runge-Kutta Fehlberg strategy alongside shooting procedure and in constraining sense are diminished to the distributed outcomes for precision reason.</p> <p><strong>&nbsp;</strong></p> Venkata Ramana Reddy Gurrampati, Kolli Vijaya Copyright (c) 2022 Journal of Naval Architecture and Marine Engineering Wed, 29 Jun 2022 00:00:00 +0000 Design of thin curved sensor to measure contact slip in fretting experiments <p><em>This paper proposes a new thin curved sensor/strip to measure the relative slip between pad and specimen under fretting condition. Since the relative contact displacement is an important parameter to categorize the fretting process, the measurement of contact displacement between pad and specimen is necessary. Because of high yield strength and the ability to return to its initial position even with notable deflection, the spring steel have chosen to fabricate the thin curved strip. Before the fabrication, the detailed Finite Element Analysis (FEA) of the thin curved sensor was carried out. The strip consists of different shapes (rectangular, circular and elliptical) of slots and the number of slots in each strip is varied from 2 to 6. The Strain Energy Approach (SEA) has been used to calculate the displacement for the curved strip and it was compared, verified and validated with its FEA and Experimental results. From FEA study of thin curved strip with slots, four configurations were chosen to measure micro level displacement between pad and specimen under fretting experiments. The study reveals that the increasing number and size of holes presented in the curved strip indicate that the increased in displacement and von-Mises stress values which offers the higher flexibility to the strip. The reduction in area and minimum thickness of the curved strip could be the reason for the decrease in the stiffness of the curved strip. This study explores the use of new simple and novel instrument/sensor to capture the micro level relative displacement between the pad and specimen under fretting condition.</em></p> Raja Pandi Rajendran, Vadivuchezhian Kaliveeran Copyright (c) 2022 Journal of Naval Architecture and Marine Engineering Wed, 29 Jun 2022 00:00:00 +0000 Similarity solution of stagnation – spot flow of a micropolar fluid above a flat exponentially elongating penetrable surface with concentration and heat production/absorption <p><em>The current study aims to explore stagnation spot flow of a micropolar liquid about a plain linear exponentially expanding penetrable surface in the incidence of </em><em>chemical reaction and in-house heat production/absorption</em><em>. Through similarity mapping, the mathematical modeling statements are reformed as ODE's and numerical results are found by shooting techniques. The impact of varying physical constants on momentum, micro-rotation, temperature and concentration are demonstrated through graphs. The computed measures including shear, couple stress and mass transfer with distinct measures of factors involved in this proposed problem are presented through a table. The presence of heat source increases the temperature of the fluid but has no impact on the velocity, angular velocity and concentration.</em></p> R. Parthiban, G. Palani Copyright (c) 2022 Journal of Naval Architecture and Marine Engineering Wed, 29 Jun 2022 00:00:00 +0000