Pump Chamber Research Articles

INFLUENCE OF THE MEASURING TOOLS ON THE FLOW CHARACTERISTICS IN VORTEX CHAMBER PUMP

Problem. Perturbation of the flow by measuring instruments forces researchers to choose optical research methods. But these methods significantly increase the cost of experimental research, due to the high cost of optical-type measuring equipment. On the other hand, using contact methods for measuring the flow velocity, such as Pitot tubes, hot-wire anemometers, the researcher must be sure that the measurement results can really be compared with the calculations results and the equipment influence on the flow parameters is minimal. The aim of this work is to study the measuring tool influence on the flow characteristics in the swirl chamber pump, as well as to compare the results obtained due to the measurements with the parameters of the undisturbed flow. The research methodology consisted of two stages: 1) modeling the flow in the model pump; 2) comparison of flow characteristics, as well as the values of velocity and pressure at the points of installation of the measuring tool. Results. Although the total velocity at the measuring point is practically independent of the measuring tool, the tangential component of the velocity is significantly reduced. It indicates that there is a significant error in velocity measuring. For a more accurate rotational velocity component measurement, it is necessary to orient the instrument perpendicular to the measured component. Scientific novelty. Installing the measuring tool in the end cover of the swirl chamber reduces the flow rate sucked by the pump through the lower axial channel. The size of the tool has practically no effect on the energy characteristics of the swirl chamber pump. Practical value. To ensure measurement accuracy, the ratio of the swirl chamber dimensions and the tool should be ensured in the way that the relative diameter of the tool does not exceed 0.25 of the swirl chamber neck diameter.

In-vitro performance of a single-chambered total artificial heart in a Fontan circulation

An in-vitro study was conducted to investigate the general feasibility of using only one pumping chamber of the SynCardia total artificial heart (TAH) as a replacement of the single ventricle palliated by Fontan circulation. A mock circulation loop was used to mimic a Fontan circulation. The combination of both ventricle sizes (50 and 70 cc) and driver (Freedom Driver and Companion C2 Driver) was investigated. Two clinical relevant scenarios (early Fontan; late Fontan) as derived from literature data were set up in the mock loop. The impact of increased transpulmonary pressure gradient, low atrial pressure, and raised central venous pressure on cardiac output was studied. From a hemodynamic point, the single-chambered TAH performed sufficiently in the setting of the Fontan circulation. Increased transpulmonary pressure gradient, from ideal to pulmonary hypertension, decreased the blood flow in combinations by almost 2 L/min. In the early Fontan scenario, a cardiac output of 3–3.5 L/min was achieved using the 50 cc ventricle, driven by the Companion C2 Driver. Even under pulmonary hypertension, cardiac outputs greater than 4 L/min could be obtained with the 70 cc pump chamber in the late Fontan scenario. In the clinically relevant Fontan scenarios, implementation of the single chambered TAH performed successfully from a hemodynamic point of view. The replacement of the failing univentricular heart by a single chamber of the SynCardia TAH may provide an alternative to a complex biventricular repair procedure or ventricular support in Fontan patients.

A MEMS-Based Drug Delivery Device With Integrated Microneedle Array-Design and Simulation.

One of the most effective treatments for type 1 and 2 diabetes is the administration of Insulin. Single needle mechanical insulin pumps are heavy and painful. Microneedle-based MEMS drug delivery devices can be an excellent solution for insulin dosing. The stackable structure provides minimum dimensions and the final product can be in the form of a patch that can be applied to any flat area of human skin. The use of microneedle array provides a safe, painless, and robust injection application. The design of positive volumetric insulin pump is a Multiphysics problem where the volumetric changes of the main pump chamber and the pumped fluid are directly coupled. We use a Multiphysics simulation system to investigate the performance of a MEMS-based insulin micropump with a piezoelectric actuator pumping a viscous Newtonian fluid. The model captures the accumulated out-flow, the netflow, or flow fluctuations based on deflection of piezoelectric diaphragm actuator. Different input voltages and different excitation frequencies cause movement of piezoelectric actuator, which moves the diaphragm disk in positive-negative directions thereby inducing discharge pressures at the microneedle array. In this study, we address various aspects of design and simulation of a MEMS-based piezoelectric insulin micropump including polydimethylsiloxane microvalves and microneedle array. We investigate the micropump performance at human skin interfacial pressure to match minimum to maximum delivery targets/requirements for total range of diabetic patient's expected operating parameters. comsolmultiphysics is used for this study.

A CFD-Based Comparison of Different Positive Displacement Pumps for Application in Future Automatic Transmission Systems

The efficiency requirements for hydraulic pumps applied in automatic transmissions in future generations of automobiles will increase continuously. In addition, the pumps must be able to cope with multiphase flows to a certain extent. Given this background, a balanced vane pump (BVP), an internal gear pump (IGP) and a three-dimensional geared tumbling multi chamber (TMC) pump are analyzed and compared by a computational fluid dynamics (CFD) approach with ANSYS CFX and TwinMesh. Furthermore, test bench measurements are conducted to obtain experimental data to validate the numerical results. The obtained numerical results show a reasonable agreement with the experimental data. In the first CFD setup, the conveying characteristics of the pumps with pure oil regarding volumetric efficiencies, cavitation onset and pressure ripple are compared. Both the IGP and the BVP show high volumetric efficiencies and low pressure ripples whereas the TMC shows a weaker performance regarding these objectives. In the second CFD setup, an oil-bubbly air multiphase flow with different inlet volume fractions (IGVF) is investigated. It can be shown that free air changes the pumping characteristics significantly by increasing pressure and mass flow ripple and diminishing the volumetric efficiency as well as the required driving torque. The compression ratios of the pumps appear to be an important parameter that determines how the multiphase flow is handled regarding pressure and mass flow ripple. Overall, the BVP and the IGP show both a similar strong performance with and without free air. In the current development state, the TMC pump shows an inferior performance because of its lower compression ratio and therefore needs further optimization.

Research on Cavitation of the Rotating-Sleeve Distributing Flow System Considering Different Cam Groove Profiles

Reciprocating piston pumps are widely used in various fields, such as automobiles, ships, aviation, and engineering machinery. Conventional reciprocating piston pump distributing flow (RPPDF) systems have the disadvantages of a loose structure and low volumetric efficiency, as well as affected positively by the operating frequency. In this paper, a novel rotating-sleeve distributing flow (RSDF) system is presented for bridging these drawbacks, as well as structurally improved to overcome the inoperable and challenging problems in oil intake and discharge found in the experiment. Moreover, the Singhal cavitation model specifically for the RSDF system and four-cam groove profiles (CGPs) is established. To find the most suitable CGP to reduce the RSDF’s cavitation, the cavitation of the RSDF system was investigated, combining with simulations by taking into account the gap among the rotating sleeve, the pump chamber, and experiments on four presented CGPs. Simulation results based on vapor volume fraction, cavitation ratio, and volumetric efficiency show that the linear profile’s cavitation is the weakest. Finally, the correctness of the simulation is verified through orthogonal experiments. This research is of great significance to the further development of the RSDF system; more important, it has great potential to promote the reform of the RPPDF method.

Three step flow focusing enables image-based discrimination and sorting of late stage 1 Haematococcus pluvialis cells.

Label-free and gentle separation of cell stages with desired target properties from mixed stage populations are a major research task in modern biotechnological cultivation process and optimization of micro algae. The reported microfluidic sorter system (MSS) allows the subsequent investigation of separated subpopulations. The implementation of a viability preserving MSS is shown for separation of late stage 1 Haematococcus pluvialis (HP) cells form a mixed stage population. The MSS combines a three-step flow focusing unit for aligning the cells in single file transportation mode at the center of the microfluidic channel with a pure hydrodynamic sorter structure for cell sorting. Lateral displacement of the cells into one of the two outlet channels is generated by piezo-actuated pump chambers. In-line decision making for sorting is based on a user-definable set of image features and properties. The reported MSS significantly increased the purity of target cells in the sorted population (94%) in comparison to the initial mixed stage population (19%).

Flow Field Numerical Simulation and Performance Analysis of Progressing Cavity Pump

SummaryProgressing cavity pump (PCP) is the essential booster equipment in oil–gas mixing delivery. Changes in relevant parameters in PCP operations directly affect the working performance and service life of the pump. On the basis of computational fluid dynamics (CFD) in this study, we apply dynamic grid technology to establish a 3D flow field numerical calculation model for the CQ11-2.4J PCP, which is used in the field of the Hounan Operation Area in Changqing oil field, China. The effects of several operating parameters, such as oil viscosity, pump rotation speed, differential pump pressure, and void fraction of oil, on the pressure and the velocity distribution of the PCP flow field are examined. Various performance parameters in the transport of the oil–gas two-phase mixture are used in the analysis, including volumetric flow rate, slippage, shaft power, volumetric efficiency, and system efficiency. The results show that the pressure and speed distribution in the pump chamber of the PCP is relatively homogenous under different working conditions, whereas the pressure and speed exhibited sharp changes at the stator and rotor sealing line and adjacent areas in the pump chamber. Increasing the viscosity of the oil and the speed of the rotor can effectively improve the flow characteristics of the PCP, but extremely high pump rotation speed would cause a decline in system efficiency. Increasing the differential pressure and the void fraction of oil would result in a decrease in the volumetric flow rate and efficiency of the PCP. Considering the variation law of the PCP's performance parameters, the optimal interval for each operating parameter of the PCP is as follows: Oil viscosity at 50–100 mPa·s, pump rotation speed at 200–300 rev/min, differential pressure at 0.2–0.3 MPa, and the void fraction of oil not more than 50%. This research can provide technical support for the optimization of the working conditions of the PCP on site.

Early Clinical Experience of a Novel Mobile Driving Unit for Pediatric VAD Support

Purpose Recently, a novel mobile driving unit (MDU) of the only approved pediatric ventricular assist device (VAD) system for both short- and long-term support of children of all sizes and ages received market approval. The MDU was specifically developed to improve mobility and autonomy of children supported with this paracorporeal (pc) VAD. This case series collects initial information with the aim to assess the first clinical experience. Methods A retrospective case series gathered anonymized patient health data of pediatric patients supported with MDU. The usability was assessed by means of a patient standardized questionnaire (numerical scale, 1= worst to 5= best). Results From February 2020 until September 2020, eight children (3 females) have been supported with a pc VAD in combination with the MDU. The median age was 1.4 years (range 0.5 - 7.5), median body surface area 0.4 m2 (0.3 - 0.9). Primary diagnosis was cardiomyopathy (CM) in 7 patients (5 dilated and 2 restrictive CM), and congenital heart disease in one child. Five patients (62.5%) received a pc VAD as left-sided and two patients as biventricular support (BVAD, 25%). One had a secondary right-sided pc VAD in combination with an implantable left-sided centrifugal VAD. The distribution of pc pump chambers by size was 10 ml pump: 2 patients (25%), 15 ml pump: 4 subjects (50%) and 30 ml pump: 2 children (25%), plus 15 ml pumps in both pc BVAD patients. The mean time of VAD support was 406 ± 241 days, with 148 ± 76 days on MDU. At the end of the observational period, 5 patients (62.5%) were still on system, 2 (25%) were transplanted and 1 died (12.5%) for causes not related to the driving unit. The survey found increased mobility (score 4.2/5), enlarged activity radius (5/5) and reduced noise nuisance (4.5/5) with MDU in comparison to the stationary unit. There were no complaints in MDU handling reported and the easiness to use was rated (4.5/5). In addition the parents reported a significant less heat generation by the MDU. The safety profile of MDU showed five adverse events: one fatal case (12.5%), one respiratory failure (12.5%), both not device-related, and two pump malfunctions (25%). One patient (12.5%) underwent pump replacement due to fibrin debris. Conclusion The case series suggests that the novel MDU is safe and effective for VAD support in the pediatric population. It is likely that MDU will increase the quality of life in this cohort.

Concept and Design of a Novel Pulsatile Left Heart Assist Device-The PERKAT Left Ventricle System.

Cardiogenic shock is associated with high mortality. Patients often require temporary mechanical circulatory support. We aimed to develop a percutaneously implantable, assist device that unloads the left ventricle (LV) in a pulsatile way. The PERkutane KATheter pump technologie (PERKAT LV) device consists of a nitinol pump chamber, which is covered by foils carrying outflow valves. A flexible tube with a pigtail-shaped tip and inflow holes represents the distal part of the pump. The system is designed for 16F percutaneous implantation. The nitinol chamber is placed in the descending aorta while the flexible tube bypasses aortic arch and ascending aorta with its tip in the LV. An intra-aortic balloon pump is placed into the chamber and connected to a console. Balloon deflation generates a blood flow from the LV into the pump chamber. During balloon inflation, blood leaves the system through the outflow foil valves in the descending aorta. Under different afterload settings using a 30 cc intra-aortic balloon pump and varying inflation/deflations rates, we recorded flow rates up to 3.0 L/min. Based on this, we believe that PERKAT LV is a promising approach for temporary LV support. The proposed design and its excellent performance give basis for in vivo tests in an animal model.

A chemical micropump actuated by self-oscillating polymer gel

Abstract We demonstrated a self-driven chemical micropump powered by self-oscillating motions of synthetic polymer gel converting chemical energy into displacements of a thin polydimethylsiloxane (PDMS) sheet to produce a directional flow via micro check valves. The gel oscillations induced by the oscillatory Belousov-Zhabotinsky (BZ) reaction generate large volume change. To effectively exploit this volume change, gel bars were used as drivers. They were sandwiched by a fixed cover glass and a push-bar to communicate the expanding (pushing) force of the gel bars to the pumping chamber. At 25 °C, this gel micropump generated a 0.07 mN stroke force and a 0.28 μL/min positive net flow in the microchannel. Additionally, the flow rate of this gel micropump was increased as the temperature was raised from 20 to 30 °C. Compared to existing chemical micropumps, this gel-based micropump provides advantages of self-oscillating property, easy refueling and thermal controllability. This gel-based soft micropump would be used as wearable or medical devices exploiting the flexibility and quietness.

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Problem. Pumping different fluids by hydraulic transport is associated with fast wear of the pump contact surfaces. The fluids being pumped are often non-Newtonian. The use of jet pumps for pumping is impractical due to low efficiency. Vortex chamber pumps may have higher efficiency when pumping non-Newtonian fluids, however, their operation on such fluids has not yet been studied. The aim of this work is to study the characteristics of the flow fields of a non-Newtonian fluid using the example of a Bingham fluid in the vortex chamber pump. Methodology. Predicting pump energy performance and determining flow fields for highly viscous fluids using CFD simulations enables advanced jet pumps to handle non-Newtonian fluids. Results. Modeling was carried out based on the numerical solution of the RANS equations with the SST turbulence model. To ensure the operability of the vortex chamber pump when pumping non-Newtonian fluid, with known rheological parameters of the mixture, it is necessary to select the required supply pressure for the active flow, and also to consider the issue of diluting the liquid with water to reduce the mixture viscosity and achieve the specified values of the pumping energy parameters. Originality. The hypothesis that the vortex chamber supercharger can operate on a hypothetical ideal fluid has been confirmed. In this case, the performance indicators of such a supercharger improve and tend to ideal. With an increase in plastic viscosity, the volumetric flow rate of the pumped fluid decreases, and at high values of the viscosity, an active flow is ejected through the axial channels. Practical value. Researchers can use the theoretical results of this work to design new devices for pumping other Bingham fluids, such as oil paint, resins, varnishes, swamp soils, and many others.

Improving Gerotor Pump Performance Trough Design, Modeling and Simulation

Gerotor pumps are well known by a compact design, simple structure and low noise level, which makes them suitable for use in the automotive industry, and especially in hydraulic systems for engine lubrication. One of the main disadvantages of gerotor pumps is the inability to adjust to wear, which significantly reduces the pump efficiency. In order to mitigate the negative effect of the inevitable wear process, this paper presents a methodology for determining the optimal combination of trochoid gears design parameters for a defined aspect. An appropriate mathematical model has been developed to analyze the effect of changes in gear design parameters in relation to maximum contact stresses, pressure changes in gerotor pump chambers and wear rate proportional factor (WRPF). Verification of the developed models was performed by realizing physical pairs of gears and laboratory experiments with simulation of pump operating conditions. The results and conclusions presented in this paper, with an emphasis on the actual work processes, bring very important perspectives for the gerotor pumps design with improved performance.

Design and development of a flexurally amplified piezoelectric actuator based piezo-hydraulic pump

Piezo-actuators can produce higher force and can be operated at higher actuation frequencies. However, the displacement range is limited to 0.1% of the actuator length. Piezo-hydraulic pumps developed using such piezo-actuators has to be operated at higher actuation frequencies to deliver higher pump flowrate. This limits the application of such piezo pumps for pumping higher viscosity fluids at higher flowrate. Thus, it is necessary to increase the displacement of piezo-actuators by different amplification mechanisms compromising with its maximum force handling capacity. Literature shows different piezo-actuator based piezo-hydraulic pumps, but piezo-hydraulic pump using flexurally amplified piezoelectric actuator is least reported anywhere. Hence, this work aims at development of a flexurally amplified piezoelectric actuator (FAPA) based piezo-hydraulic pump. The design of piezo-hydraulic pump consists of FAPA376 as pumping actuator and the pumping chamber is made from stainless steel metallic bellows. The inlet and outlet ports coming out from pumping chamber are connected with two unidirectional valves to avoid back flow of the fluid. The pumping actuator FAPA376 produces a maximum displacement of 376 µm when applied with its rated voltage signal of 150 V and hence by the name FAPA376. Suitable mathematical model for piezo-hydraulic pump is developed using MATLAB/Simulink software and simulations are carried out to determine pumping displacement and flowrate of the piezo-hydraulic pump. Simulation resulted with pumping peak displacement of 375.5 µm, hysteresis of 27.17 µm and flowrate of 25.55 mL/min at 1 Hz actuation frequency. Experiments are performed on developed piezo-hydraulic pump at different actuation frequencies to determine its pumping displacement and flow rate. Experiments carried out on the piezo-hydraulic pump at 1 Hz actuation frequency resulted with pumping peak displacement of 369 µm, hysteresis of 16.22 µm and flowrate of 25.36 mL/min. The simulated and experimental flowrate of piezo-hydraulic pump are in good agreement with each other having an error of 0.75% at 1 Hz.

Estimation of the forecast of pump ready rate for reclamation systems

The aim of the authors’ research is to improve the hydraulic conditions for supplying the flow to the impeller and to reduce the cavitation wear of the pump working bodies. This goal is achieved by the fact that the device for supplying liquid at the inlet to the pump contains guide elements in the form of flat plates mounted on the axis of the suction pipe. With further modernization, the pumped liquid was stabilized after the impeller, with the elimination of vortex flows along the entire flow path of the pump due to new elements in the pump chamber. The problem is solved by the design of a straightening blade with a free cross-sectional area of the wall channel less than the inner channel. The research methods include the conduct of field and laboratory studies using modern technical means of observation. Long-term experimental work carried out at large pumping stations investigates interconnected systems of connecting structures and pumps. The stability function is determined as a result of taking into account a number of factors: the external environment, technological properties of systems and operational requirements. The change in the critical, from the point of view of the emergence of cavitation, the value of the pump supply from different densities of the pumped liquids was established as a result of bench tests. In the experiments, the cavitation erosion of the growth was compared with analogs in the average 90-100 times. The ratio of the performance of the surface tension force to the density for mercury and water at a temperature of 15° C turned out to be equal to 91. As a result of the development of a new design together with Joint-Stock Company SUVMASH and the method of calculating the working parts of the pump with a minimum wear rate of the pump with a minimum wear rate of 5%.

Ecology and Economics of Oil Production

Nowadays, the world is facing the depletion of developed reserves and the exploitation of fields with poor reservoir features. These factors are forcing oil producers to use low-capacity high-head electric centrifugal submersible pump units (ESP). The use of such ESP in oil production causes pump temperature to rise to about a hundred degrees centigrade. Increasing the temperature strength of the cable line used as part of the ESP reduces the number of failures in terms of the electrical component. In order to reduce the number of ESP failures due to cable line fusing, oil producers started using cable lines with operating temperatures of over 200оС. Increasing the temperature strength of the cable line used as part of the ESP leads to a partial decrease in failures due to a reduction in the electric resistance of the “cable-motor” system. Meanwhile, failures of ESPs due to salt deposition in the pump stages started to grow. In the absence of any theoretical insight into the salt deposition phenomenon, ESP manufacturers started providing oil producers with various devices to protect pump stages from salt deposition. However, it soon became clear that these devices (containers with chemical salts) show no tangible results in terms of salt deposition elimination; hence, over the past few years, oil production enterprises have been maintaining the proper operation of ESPs by the regular dosing of chemicals to the pump suction or by hydrochloric acid treatment. Investigation of the failed ESP units has reliably ascertained the following: formation and effect of high temperature in and around the centrifugal pump; effect of the pump’s high temperature on the adjacent cable line; application of cable lines with high operating temperatures leads to salt deposition in the centrifugal pump chamber; salt deposition accompanies temperature deformation of the cable line’s insulation; acid treatment does not protect the ESP unit against salt deposition; acid treatment may result in the wear of a flow string; Therefore, solution of the salt deposition problem should start with an investigation of the dependence of a centrifugal pump’s temperature on the oil reservoir’s working parameters. The solution of many oil production problems and a reduction in oil recovery costs can only be achieved by means of ESP control automation. The described revolutionary studies of ESP operation in oil recovery will lay the foundation for a complete robotization of oil production.

Analysis and Optimization on Vibration Characteristics of Twin Screw Pump

Based on double screw pump as the research object, the vibration of twin screw pump under different outlet conditions and different technological parameters were tested. The vibration characters of the pump under various technological parameters were analyzed from the experimental point of view. The key parameters influencing the vibration characteristic of twin screw pump were found out and corresponding optimization measures were taken. By using the numerical method of fluid mechanics, the three-dimensional flow field inside the pump chamber was analyzed, and the internal working mechanistic and influencing factors were discussed. Local optimization was carried out to reduce the influence of fluid excitation force on structure vibration. The research results of this paper can provide necessary practical basis for the optimization of vibration and noise reduction of twin screw pump.

Simulation of Stirling driven desalination power system

This paper presents a new power system for reverse osmosis desalination, which is composed of a Stirling engine driven booster pump and a reciprocating piston pump rigidly connected. Firstly, the physical model is established by SolidWorks, and then the frequency of reciprocating motion of piston is calculated through the principle of piston component motion. Then, the UDF file of piston motion is compiled. Then, CFD analysis is carried out by FLUENT software to select the standard the temperature field, velocity field and pressure field in the pump chamber of Stirling engine are simulated by coupled method, and the output work of the engine is studied. The results show that the gas movement in Stirling engine is stable, the pressure at the discharge port of reciprocating pump is greater than the required osmotic pressure, and the whole power system can operate normally.

Optimal design of vortex chamber pump

The difficult operating conditions during the pumping of abrasive solid mediums lead to the rapid wear of the mechanical parts of the pumps. The use of jet pumps can significantly increase the reliability and durability of pumping equipment. However, direct-flow jet pumps have low efficiency. The use of the centrifugal force led to the creation of new jet pumps - vortex chamber pumps. Their performance indicators are better than direct-flow jet pump ones. The geometric parameters of the flow channel of the vortex chamber pumps were optimized. The study was carried out experimentally and numerically. Numerical simulation is based on solving the RANS equations with the shear stress transport turbulence model. The geometrical dimensions of the vortex chamber pump with the best performance indicators such as pressure and flow are found. The maximum achievable operating parameters of the vortex chamber pump are analyzed. The comparison of simulation results with experimental data is made.

Resonant Type Piezoelectric Pump Driven at the Power Frequency Using a Tuning Fork Vibrator

A resonant type piezoelectric pump driven by a tuning fork vibrator (TFV) is developed in this study. The resonant frequency of the TFV is designed to be the power frequency, thus the pump can directly work in a resonant state under a power frequency power supply. Three factors affecting the performance of the piezoelectric pump are investigated in this paper, including the thickness of the TFV, the material of the pump chamber diaphragm and the quantity of inlet valve. The Taguchi method is adopted to obtain the best combination among the three factors. In accordance with the optimized results of the Taguchi method, a final prototype piezoelectric pump is fabricated via 3D printing technology. When driven by the power frequency power supply, the maximum flow rate of the prototype piezoelectric pump can reach 441.77 ml/min.

An innovative hybrid-solar-vacuum dryer to produce high-quality dried fruits and vegetables

Food drying uses much energy and is considered a high carbon footprint process. Solar drying is sustainable, but the dryers must be improved to produce high-quality foods in short times. In this study, a hybrid-solar vacuum dryer was designed, built, and applied to fruit dehydration. A solar heater was coupled to a thermally insulated reservoir with electrical resistances to provide hot water at 90 °C as the indirect heating medium. Drying chambers with a full capacity of 4 kg of sliced food were operated under vacuum or vacuum pulses (conductive multiflash drying). Banana slices could be dried with the most basic equipment configuration (vacuum chamber, vapor condenser, and vacuum pump), resulting in homogeneous and crispy snacks. The dryer was also tested for persimmons and carrots. The drying of all the fruit and vegetable samples resulted in dried and crisp products in 3–4 h, depending on the drying temperature, and the use of continuous electric support for temperatures higher than 70 °C. The hybrid solar dryer operating under vacuum is an innovative and clean technology that results in high-quality products and has excellent potential to be used in small farms.