Sandeep Rimza - Academia.edu (original) (raw)

Papers by Sandeep Rimza

Research paper thumbnail of Preparation, stabilization, and thermal characterization of CuO/water nanofluids applicable to domestic solar water heater

Materials Today: Proceedings, May 1, 2023

Research paper thumbnail of A Case Study of Thermal Mixing Behavior of Hot and Cold Fluid in T-Junction With/Without Mixing Jets

Research paper thumbnail of An experimental and numerical study of flow and heat transfer in helium cooled divertor finger mock-up with sectorial extended surface

Applied Thermal Engineering, May 1, 2015

ABSTRACT A jet impingement technique with a sectorial extended surface (SES) concept for the modu... more ABSTRACT A jet impingement technique with a sectorial extended surface (SES) concept for the modular helium-cooled divertor has been studied within the framework of the post ITER tokamak, at the Institute for plasma research (IPR), INDIA. Experimental and numerical studies have been conducted to predict the thermal hydraulic performance of a finger type divertor design with proposed SES. Critical thermal hydraulic parameters, effective heat transfer coefficient and pressure loss have been measured in the experiment for the reference divertor as well as for a divertor with SES. The experimental mock-ups are made to full scale respecting Reynolds and Prandtl number similarities. Air is used as the simulant to represent helium, which is used as the coolant in prototype. A novel heat concentrator has been developed to simulate the high heat flux, by electrical heating. The benchmark experimental data have been used to validate the three dimensional conjugate heat transfer models. The computational result for heat transfer coefficients and pressure loss are in satisfactory agreement with the experimental results. Based on detailed parametric studies, correlations have been proposed for Nusselt number and pressure loss coefficient as a function of Reynolds number which can be used for design applications. The proposed SES divertor is seen to significantly augment the thermal performance of the finger type divertor at the penalty of a minimum pressure drop at the prototypical condition. The results of the present study provide added confidence in the numerical model used to design the divertor and its applicability to other high heat flux gas cooled components.

Research paper thumbnail of High Temperature Vacuum Brazing of Tungsten to Tungsten Alloy with Structural Material

Research paper thumbnail of Studies on Helium cooled plasma facing components for tokamak based fusion reactor applications

Research paper thumbnail of An Experimental Study of Surface Improvement in FDM Parts by Vapor Treatment Process

Journal of Mechanical Engineering Research, 2020

Fused deposition modeling (FDM) is one of the most adaptable additive manufacturing method owing ... more Fused deposition modeling (FDM) is one of the most adaptable additive manufacturing method owing to the cost-effectiveness and environment-friendly nature. However, FDM technique still possesses major difficulties in terms of poor surface quality because of adding layer by layer manufacturing process for the prototypes. It is desirable to explore an efficient technique for FDM parts to enhance the poor surface quality and dimensions precision. In the present paper, an effort has been made to enhance the surface quality and optimize the critical processing parameter of FDM based benchmark using vapor smoothing process (VSP). A comparative experimental study has been performed by design of experiments (DOE), Taguchi technique to find the influence of input design parameters on the surface finish of benchmark FDM parts. The results of the present investigation show that VSP treatment improves the surface quality of FDM parts to micro level with negligible dimensional variation. It is o...

Research paper thumbnail of Development of heat sink concept for near-term fusion power plant divertor

Journal of Physics: Conference Series, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Research paper thumbnail of Computational fluid dynamic studies on plasma facing heat sink concept for fusion tokamak application

Applied Thermal Engineering, 2016

 A modular divertor heat sink concept is proposed for fusion tokamak application.  Effects of i... more  A modular divertor heat sink concept is proposed for fusion tokamak application.  Effects of important parameters on the heat transfer characteristics are critically discussed.  The use of multiple nozzles of various shapes is investigated by 3-dimensional CFD studies.  Thermo-mechanical analysis is performed towards ensuring acceptability of the design from structural integrity consideration.

Research paper thumbnail of Optimal design of divertor heat sink with different geometric configurations of sectorial extended surfaces

Fusion Engineering and Design, 2015

ABSTRACT

Research paper thumbnail of Numerical studies on cooling finger mock-up of helium cooled divertor

Fusion Engineering and Design

Fusion Engineering and Design j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l... more Fusion Engineering and Design j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / f u s e n g d e s Numerical studies on helium cooled divertor finger mock up with sectorial extended surfaces h i g h l i g h t s • Studies on heat transfer enhancement for divertor finger mock-up. • Heat transfer characteristics of jet impingement with extended surfaces have been investigated. • Effect of critical parameters that influence the thermal performance of the finger mock-up by CFD approach. • Effect of extended surface in enhancing heat removal potential with pumping power assessed. • Practicability of the chosen design is verified by structural analysis. a b s t r a c t Jet impinging technique is an advance divertor concept for the design of future fusion power plants. This technique is extensively used due to its high heat removal capability with reasonable pumping power and for safe operation. In this design, plasma-facing components are fabricated with numero...

Research paper thumbnail of Numerical studies on helium cooled divertor finger mock up with sectorial extended surfaces

Fusion Engineering and Design, 2014

Research paper thumbnail of An experimental and numerical study of flow and heat transfer in channels with pin fin-dimple and pin fin arrays

Experimental Thermal and Fluid Science, 2012

An experimental and numerical study was conducted to investigate the flow friction and heat trans... more An experimental and numerical study was conducted to investigate the flow friction and heat transfer performance in rectangular channels with staggered arrays of pin fin-dimple hybrid structures and pin fins in the Reynolds number range of 8200-54,000. The study aims at improving the cooling design for the gas turbine components. The friction factor, Nusselt number and the overall thermal performance parameters of the pin fin-dimple and the pin fin channels have been obtained and compared with the experimental data of a smooth rectangular channel and previously published data of the pin fin channel. The comparisons showed that, compared with the pin fin channel, the pin fin-dimple channel has further improved convective heat transfer performance by about 8.0% and whereas lowered flow friction by more than 18.0%. In addition, fully three-dimensional numerical computations have been done to investigate the physical details about the flow and heat transfer in the pin fin and pin fin-dimple channels. The computations showed that the dimples increase the near-wall turbulent mixing level by producing strong vortex flows, and therefore enhance the convective heat transfer in the channel. On the other hand, the dimples enlarge the minimum cross section area transversely between the pin fins, and therefore the pressure loss in the flow can be reduced in the pin fin-dimple channels.

Research paper thumbnail of Preparation, stabilization, and thermal characterization of CuO/water nanofluids applicable to domestic solar water heater

Materials Today: Proceedings, May 1, 2023

Research paper thumbnail of A Case Study of Thermal Mixing Behavior of Hot and Cold Fluid in T-Junction With/Without Mixing Jets

Research paper thumbnail of An experimental and numerical study of flow and heat transfer in helium cooled divertor finger mock-up with sectorial extended surface

Applied Thermal Engineering, May 1, 2015

ABSTRACT A jet impingement technique with a sectorial extended surface (SES) concept for the modu... more ABSTRACT A jet impingement technique with a sectorial extended surface (SES) concept for the modular helium-cooled divertor has been studied within the framework of the post ITER tokamak, at the Institute for plasma research (IPR), INDIA. Experimental and numerical studies have been conducted to predict the thermal hydraulic performance of a finger type divertor design with proposed SES. Critical thermal hydraulic parameters, effective heat transfer coefficient and pressure loss have been measured in the experiment for the reference divertor as well as for a divertor with SES. The experimental mock-ups are made to full scale respecting Reynolds and Prandtl number similarities. Air is used as the simulant to represent helium, which is used as the coolant in prototype. A novel heat concentrator has been developed to simulate the high heat flux, by electrical heating. The benchmark experimental data have been used to validate the three dimensional conjugate heat transfer models. The computational result for heat transfer coefficients and pressure loss are in satisfactory agreement with the experimental results. Based on detailed parametric studies, correlations have been proposed for Nusselt number and pressure loss coefficient as a function of Reynolds number which can be used for design applications. The proposed SES divertor is seen to significantly augment the thermal performance of the finger type divertor at the penalty of a minimum pressure drop at the prototypical condition. The results of the present study provide added confidence in the numerical model used to design the divertor and its applicability to other high heat flux gas cooled components.

Research paper thumbnail of High Temperature Vacuum Brazing of Tungsten to Tungsten Alloy with Structural Material

Research paper thumbnail of Studies on Helium cooled plasma facing components for tokamak based fusion reactor applications

Research paper thumbnail of An Experimental Study of Surface Improvement in FDM Parts by Vapor Treatment Process

Journal of Mechanical Engineering Research, 2020

Fused deposition modeling (FDM) is one of the most adaptable additive manufacturing method owing ... more Fused deposition modeling (FDM) is one of the most adaptable additive manufacturing method owing to the cost-effectiveness and environment-friendly nature. However, FDM technique still possesses major difficulties in terms of poor surface quality because of adding layer by layer manufacturing process for the prototypes. It is desirable to explore an efficient technique for FDM parts to enhance the poor surface quality and dimensions precision. In the present paper, an effort has been made to enhance the surface quality and optimize the critical processing parameter of FDM based benchmark using vapor smoothing process (VSP). A comparative experimental study has been performed by design of experiments (DOE), Taguchi technique to find the influence of input design parameters on the surface finish of benchmark FDM parts. The results of the present investigation show that VSP treatment improves the surface quality of FDM parts to micro level with negligible dimensional variation. It is o...

Research paper thumbnail of Development of heat sink concept for near-term fusion power plant divertor

Journal of Physics: Conference Series, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Research paper thumbnail of Computational fluid dynamic studies on plasma facing heat sink concept for fusion tokamak application

Applied Thermal Engineering, 2016

 A modular divertor heat sink concept is proposed for fusion tokamak application.  Effects of i... more  A modular divertor heat sink concept is proposed for fusion tokamak application.  Effects of important parameters on the heat transfer characteristics are critically discussed.  The use of multiple nozzles of various shapes is investigated by 3-dimensional CFD studies.  Thermo-mechanical analysis is performed towards ensuring acceptability of the design from structural integrity consideration.

Research paper thumbnail of Optimal design of divertor heat sink with different geometric configurations of sectorial extended surfaces

Fusion Engineering and Design, 2015

ABSTRACT

Research paper thumbnail of Numerical studies on cooling finger mock-up of helium cooled divertor

Fusion Engineering and Design

Fusion Engineering and Design j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l... more Fusion Engineering and Design j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / f u s e n g d e s Numerical studies on helium cooled divertor finger mock up with sectorial extended surfaces h i g h l i g h t s • Studies on heat transfer enhancement for divertor finger mock-up. • Heat transfer characteristics of jet impingement with extended surfaces have been investigated. • Effect of critical parameters that influence the thermal performance of the finger mock-up by CFD approach. • Effect of extended surface in enhancing heat removal potential with pumping power assessed. • Practicability of the chosen design is verified by structural analysis. a b s t r a c t Jet impinging technique is an advance divertor concept for the design of future fusion power plants. This technique is extensively used due to its high heat removal capability with reasonable pumping power and for safe operation. In this design, plasma-facing components are fabricated with numero...

Research paper thumbnail of Numerical studies on helium cooled divertor finger mock up with sectorial extended surfaces

Fusion Engineering and Design, 2014

Research paper thumbnail of An experimental and numerical study of flow and heat transfer in channels with pin fin-dimple and pin fin arrays

Experimental Thermal and Fluid Science, 2012

An experimental and numerical study was conducted to investigate the flow friction and heat trans... more An experimental and numerical study was conducted to investigate the flow friction and heat transfer performance in rectangular channels with staggered arrays of pin fin-dimple hybrid structures and pin fins in the Reynolds number range of 8200-54,000. The study aims at improving the cooling design for the gas turbine components. The friction factor, Nusselt number and the overall thermal performance parameters of the pin fin-dimple and the pin fin channels have been obtained and compared with the experimental data of a smooth rectangular channel and previously published data of the pin fin channel. The comparisons showed that, compared with the pin fin channel, the pin fin-dimple channel has further improved convective heat transfer performance by about 8.0% and whereas lowered flow friction by more than 18.0%. In addition, fully three-dimensional numerical computations have been done to investigate the physical details about the flow and heat transfer in the pin fin and pin fin-dimple channels. The computations showed that the dimples increase the near-wall turbulent mixing level by producing strong vortex flows, and therefore enhance the convective heat transfer in the channel. On the other hand, the dimples enlarge the minimum cross section area transversely between the pin fins, and therefore the pressure loss in the flow can be reduced in the pin fin-dimple channels.