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Mt Ir. Sartono Putro - One of the best experts on this subject based on the ideXlab platform.
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Studi Eksperimen Heat Exchanger Cross Flow Circular Fin Tube Variasi Mass Flow Rate Fluida Dingin
2019Co-Authors: Rouf Muhammad, Mt Ir. Sartono Putro, S.t. Muhammad SyukronAbstract:The purpose of this research is to know the effect of Cold Fluid mass flow rate to Cold temperature change of Fluid, change of heatrate received Cold Fluid, total heat transfer coefficient, Cold Fluid heat transfer coefficient, heat exchanger efficiency, and and change of curing load mass in the form of cassava at heat exchanger cross flow circular fin tube with drying loads 1 kg and heat exchanger cross flow circular fin tube with driying loads 1.5 kg. The flow used is a crossed stream, where Cold Fluid is flowed to the heat exchanger through the tube. The Cold Fluid will receive the heat from the hot Fluid generated from the LPG gas combustion process. Hot Fluid is flowed on a heat exchanger shell. The Cold Fluid that has been flowed in the heat exchanger tube and receives the heat will go out to the drying machine used to dry the cassava as a drying load. In heat exchanger cross flow circular fin tube with drying loads 1 kg, the optimum result is obtained in Cold Fluids with mass flow rate of 0.028 kg/s with the change of cassava mass of 0.1 kg, the temperature change of Cold Fluid 121.7 oC, the heat rate received by Cold Fluida of 3388.2 Watt, the total heat transfer coefficient 5.380 W/m2K, the heat transfer coefficient of Cold Fluid 351 W/m2K, and efficiency of heat exchanger 61.4%. In the heat exchanger cross flow circular fin tube with drying loads 1.5 kg, the optimum result is obtained in Cold Fluid with a mass flow rate of 0.028 kg/s with a change of cassava mass of 0.09 kg, the temperature change of Cold Fluid 114.4 oC, heat receiving rate of 3248.0 watt, the total heat transfer coefficient 5.885 W/m2K, the heat transfer coefficient of Cold Fluid 354 W/m2K and heat exchanger efficiency of 58.9%.
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Studi Eksperimen Performansi Heat Exchanger Crossflow Unmixed, Finned Tube 4 Passes Dengan Variasi Putaran Dan Volume Flow Rate Pada Rotary Dryer Untuk Mengeringkan Singkong
2018Co-Authors: Hayyu Avtur Isnaini, Mt Ir. Sartono PutroAbstract:A heat exchanger is a device used to transfer heat between two or more Fluids and which function either as a heater or a coolant. The unit of Heat Exchanger is consist of air heater and rotary dryer. This research is aimed to get the optimum value of rotary dryer rotation and volume flow rate in cassava’s drying process. Matters from the cassava’s drying process were cassava’s mass reduction, cassava’s heat accepted, rotary dryer’s efficiency, and heat exchanger’s efficiency. The rotary dryer variatons used were 26,1 rpm; 33,9 rpm; and 44,2 rpm then the volume flow rate variations used were 0,023 m³/s; 0,027 m³/s; and 0,029m³/s. The way this heat exchanger works is the air as the Cold Fluid coming out from the blower then entering the air heater. Inside of the air heater the Cold Fluid receives heat from the hot Fluid that flowing between the air heater shells. The heat source used comes from a simple stove under the air heater. After receiving the heat, the hot air has entered the rotary dryer which functions as a dryer. The optimum drying drying results when the pully of rotary dryer was setting at a speed of 26.1 rpm and the volume of Cold Fluid flow rate was 0.029 m³ / s is 0.235kg. The heat received by cassava from the optimum drying process when pully of the rotary dryer was setting at a speed of 26.1 rpm and the volume of Cold Fluid flow rate was 0.029 m³ / s is 521300.7 J. The optimal value of the efficiency of the rotary dryer and heat exchanger respectively 14.541% and 4.158% when pully in the rotary dryer was setting at a speed of 26.1 rpm and the volume of Cold Fluid flow rate was 0.029 m³ / s. Pully rotation in the best rotary dryer is when the pully was rotating at a speed of 26.1 rpm and the Cold Fluid volume was 0.029 m³ / s. Keywords : heat exchanger, air heater, rotary dryer, mass, efficiency.
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Rancang Bangun Dan Pengujian Heat Exchanger Cross Flow Rectangular Fin Tube Variasi Mass Flow Rate Fluida Dingin
2018Co-Authors: Muhammad Syarif Hidayat, Mt Ir. Sartono PutroAbstract:Heat exchanger is an equipment used to move heat between two Fluids or more without the occurrence of mixing (direct contact) between the Fluids. The purpose of this research is to know the effect of Cold Fluid mass flow rate to Cold temperature change of Fluid, change of heat rate received Cold Fluid, total heat transfer coefficient, Cold Fluid heat transfer coefficient, heat exchanger efficiency, and change of curing load mass in the form of cassava at heat exchanger cross flow 2 rectangular fin tube and heat exchanger cross flow 4 rectangular fin tube. The flow of this heat exchanger is a cross flow, where Cold Fluid is flowed to the heat exchanger through the tube. The Cold Fluid will receive the heat from the hot Fluid generated from the LPG gas combustion process. Hot Fluid is flowed on a heat exchanger shell. The Cold Fluid that has been flowed in the heat exchanger tube and receives the heat will go out to the drying machine used to dry the cassava as a drying load. In heat exchanger cross flow 2 rectangular fin tube, the optimum result is obtained in Cold Fluids with mass flow rate of 0.022 Kg / s with the change of cassava mass of 0.2 Kg, the heat rate received by Cold Fluida of 2755.3 watt and efficiency of heat exchanger 49.9%. In the heat exchanger cross flow 4 rectangular fin tube, the optimum result is obtained in Cold Fluid with a mass flow rate of 0.023 Kg / s with a change of cassava mass of 0.21 Kg, heat receiving rate of 3858.3 watt, and heat exchanger efficiency of 69.9%.
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Rancang Bangun Dan Pengujian Heat Exchanger Cross Flow Unmixed, Finned Tube Four Pass, Untuk Mengeringkan Empon-Empon Dengan Variasi Mass Flow Rate
2017Co-Authors: Yusuf Wijanarko, Mt Ir. Sartono PutroAbstract:A heat exchanger is a device used to transfer heat from the system to another system without mass transfer and may serve as a heater or as a coolant. The purpose of this research is to know the effect of mass flow rate on Heat Exchanger Cross Flow Unmixed, Finned Tube Four Pass to temperature change, heat change, change of Cold Fluid heat transfer coefficient, total heat transfer change, heat exchanger efficiency change, and mass change of temulawak, with variation of mass flow rate 0,025kg/s, 0,029kg/s, 0,033kg/s, and 0,035kg/s. The operation of this Heat Exchanger is to utilize the flow of Cold Fluid out of the centrifugal blower, which then Cold fuid into the Heat Exchanger, in the Heat Exchanger the Cold Fluid will receive the heat from the hot Fluid flowing between the Heat Exchanger shell, where the hot Fluid is sourced from the burner under the Heat Exchanger, after which the Cold Fluid that has received the heat comes from the Heat Exchanger to the engine medicinal dryer. The optimum drying result is obtained with Cold Fluid mass flow rate 0.029kg / s and with the result of herp mass change of 339 gram. If it is seen from the diagram of the influence of mass flow rate on the heat received Cold Fluid, and the diagram of mass flow rate influence on the change of temulawak mass it can be concluded that the change of Cold air temperature (ΔTc) and Cold air flow rate is the main factor in drying process Using the Heat Exchanger.
Nathaniel J. Fisch - One of the best experts on this subject based on the ideXlab platform.
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Three-wave scattering in magnetized plasmas: from Cold Fluid to quantized Lagrangian
Physical Review E, 2017Co-Authors: Yuan Shi, Hong Qin, Nathaniel J. FischAbstract:Large amplitude waves in magnetized plasmas, generated either by external pumps or internal instabilities, can scatter via three-wave interactions. While three-wave scattering is well known in collimated geometry, what happens when waves propagate at angles with one another in magnetized plasmas remains largely unknown, mainly due to the analytical difficulty of this problem. In this paper, we overcome this analytical difficulty and find a convenient formula for three-wave coupling coefficient in Cold, uniform, magnetized, and collisionless plasmas in the most general geometry. This is achieved by systematically solving the Fluid-Maxwell model to second order using a multiscale perturbative expansion. The general formula for the coupling coefficient becomes transparent when we reformulate it as the scattering matrix element of a quantized Lagrangian. Using the quantized Lagrangian, it is possible to bypass the perturbative solution and directly obtain the nonlinear coupling coefficient from the linear response of the plasma. To illustrate how to evaluate the Cold coupling coefficient, we give a set of examples where the participating waves are either quasitransverse or quasilongitudinal. In these examples, we determine the angular dependence of three-wave scattering, and demonstrate that backscattering is not necessarily the strongest scattering channel in magnetized plasmas, in contrast to what happens in unmagnetized plasmas. Our approach gives a more complete picture, beyond the simple collimated geometry, of how injected waves can decay in magnetic confinement devices, as well as how lasers can be scattered in magnetized plasma targets.
H Bindslev - One of the best experts on this subject based on the ideXlab platform.
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Comparison of kinetic and Cold Fluid models of three-wave mixing and Thomson scattering
Plasma Physics and Controlled Fusion, 1995Co-Authors: H BindslevAbstract:The use of the Cold Fluid (CF) model for describing scattering from thermal fluctuations was initially suggested by Sitenko (1967) and has since been widespread. This use of the CF model was shown to be inappropriate by Bindslev (ibid., vol. 35, p. 1615 (1993)) where the low-temperature kinetic (LTK) model was proposed instead. Sitenko in his present comment (ibid., vol. 37, p. 163 (1994)) appears to reject the findings of Bindslev but only deals with scattering from Cold collective fluctuations, not thermal fluctuations. Here we confirm the findings by Bindslev that the CF model is inappropriate for describing the bilinear interaction of thermal waves and, in particular, scattering from thermal fluctuations. We note that although both the LTK and the CF models describe scattering in collisionless plasmas and both models involve only fields and zeroth- and first-order moments of distribution functions, they are nonetheless fundamentally different: within the limits of the collisionless plasma model, the LTK model makes no assumptions about the nature of the interacting waves and fluctuations. The CF model, on the other hand, has only been shown to be correct when the Cold Fluid relations apply to both interacting waves and thus is only guaranteed to correctly describe the interaction of Cold collective electron oscillations in a collisionless plasma. We demonstrate that the use of the CF model in present microwave scattering experiments on fusion plasmas can lead to significant errors, and finally note that there is no computational advantage in using the CF model rather than the LTK model.
Daniel H. E. Dubin - One of the best experts on this subject based on the ideXlab platform.
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Displacement eigenmodes for Cold-Fluid and warm-Fluid magnetized plasma oscillations
Physics of Plasmas, 2005Co-Authors: Daniel H. E. DubinAbstract:Cold-Fluid and warm-Fluid electrostatic plasma modes of magnetized nonuniform plasmas are determined as eigenfunctions of an integral equation describing the perturbed Fluid displacement. The frequencies of these displacement eigenmodes are always real. In some cases, the modes are singular and form a continuous spectrum, and this causes spatially Landau-damped quasimodes to appear in the response to initial perturbations. In other cases the spectrum is discrete. Finite-temperature frequency shifts, of interest as a temperature diagnostic, are evaluated and compared to analytic theory.
Yuan Shi - One of the best experts on this subject based on the ideXlab platform.
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Three-wave scattering in magnetized plasmas: from Cold Fluid to quantized Lagrangian
Physical Review E, 2017Co-Authors: Yuan Shi, Hong Qin, Nathaniel J. FischAbstract:Large amplitude waves in magnetized plasmas, generated either by external pumps or internal instabilities, can scatter via three-wave interactions. While three-wave scattering is well known in collimated geometry, what happens when waves propagate at angles with one another in magnetized plasmas remains largely unknown, mainly due to the analytical difficulty of this problem. In this paper, we overcome this analytical difficulty and find a convenient formula for three-wave coupling coefficient in Cold, uniform, magnetized, and collisionless plasmas in the most general geometry. This is achieved by systematically solving the Fluid-Maxwell model to second order using a multiscale perturbative expansion. The general formula for the coupling coefficient becomes transparent when we reformulate it as the scattering matrix element of a quantized Lagrangian. Using the quantized Lagrangian, it is possible to bypass the perturbative solution and directly obtain the nonlinear coupling coefficient from the linear response of the plasma. To illustrate how to evaluate the Cold coupling coefficient, we give a set of examples where the participating waves are either quasitransverse or quasilongitudinal. In these examples, we determine the angular dependence of three-wave scattering, and demonstrate that backscattering is not necessarily the strongest scattering channel in magnetized plasmas, in contrast to what happens in unmagnetized plasmas. Our approach gives a more complete picture, beyond the simple collimated geometry, of how injected waves can decay in magnetic confinement devices, as well as how lasers can be scattered in magnetized plasma targets.