Design of a miniature pump
The applications of pumps are becoming increasingly extensive and there are more application-specific constraints that are imposed on pump designs, including constraints in size and capacity. Thus, miniature pumps have gained their popularity in many industries such as pharmaceutical, medical, ME...
| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/53650 |
| _version_ | 1811688096932036608 |
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| author | Lieu, Chee Fui |
| author2 | Chan Weng Kong |
| author_facet | Chan Weng Kong Lieu, Chee Fui |
| author_sort | Lieu, Chee Fui |
| collection | NTU |
| description | The applications of pumps are becoming increasingly extensive and there are more
application-specific constraints that are imposed on pump designs, including constraints
in size and capacity. Thus, miniature pumps have gained their popularity in many
industries such as pharmaceutical, medical, MEMS applications etc. The design and
development of a miniature pump is necessary to serve these applications. However,
miniaturization process is both difficult and challenging.
In this project, a miniature pump with better performance has been designed and
developed. Several designs are discussed and explored and the reciprocating ball pump
(RBP) is proposed. The working principle of the RBP is presented. The RBP is unique
in that it does not require any valves to regulate flow and inherently produce unidirectional
flow. In addition, the design of this pump is simple, compact and easy to
fabricate. Besides that, this pump has potential in pumping fluid with minimal
contamination because the pumping unit is small in size and it does not require a seal
and bearing. Furthermore, it has the potential in generating a higher flow rate as
compared to the conventional reciprocating pump. The final RBP is 19.5 mm long, has
a diameter of 18.8 mm and weighs less than 25 grams.
In this research project, a mathematical model has been developed with some
assumptions and simplifications to reveal the working principle and to evaluate the
performance of the RBP. It also enables the prediction on the instantaneous flow rate
and pressure variations upstream and downstream of the RBP. In addition, parametric
studies have been conducted to determine the effects of the weight of the ball and thesize of the pumping unit on its performance. In addition, parametric studies show that
the optimal RBP has a casing length of 11.5 mm, a ball of diameter 9.6 mm with a rear
cap hole diameter of 8.5 mm.
CFD simulation with fluid-structure-interaction (FSI) of the RBP has been successfully
conducted via ANSYS-FLUENT by using moving and deforming dynamic mesh model
with user-defined-function (UDF). Asides from revealing the working principle and the
performance of the RBP, CFD simulation also shows the working principle of the RBP
in a more comprehensive manner through the pressure distribution and velocity flow
field.
Subsequently, the functionality of the RBP has been verified by experimental studies. In
addition, a modified test rig was used to conduct flow visualization experiments. The
mathematical model and CFD simulation have been validated by the experimental
performance characteristic and flow visualization studies as they agree qualitatively
with the results obtained from both mathematical model and CFD simulation.
The three studies show that the RBP generates additional induced flow especially during
its backward stroke even though the RBP is operated at a back pressure of as high as
1000 Pa. This proves that the RBP is superior to a conventional reciprocating pump
having the same dimensions. The RBP has a flow efficiency of as high as 172.15%,
170.88% and 159.90% which are measured through mathematical model, CFD
simulation and experimental studies respectively. |
| first_indexed | 2024-10-01T05:26:47Z |
| format | Thesis |
| id | ntu-10356/53650 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:26:47Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/536502023-03-11T17:30:45Z Design of a miniature pump Lieu, Chee Fui Chan Weng Kong School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics The applications of pumps are becoming increasingly extensive and there are more application-specific constraints that are imposed on pump designs, including constraints in size and capacity. Thus, miniature pumps have gained their popularity in many industries such as pharmaceutical, medical, MEMS applications etc. The design and development of a miniature pump is necessary to serve these applications. However, miniaturization process is both difficult and challenging. In this project, a miniature pump with better performance has been designed and developed. Several designs are discussed and explored and the reciprocating ball pump (RBP) is proposed. The working principle of the RBP is presented. The RBP is unique in that it does not require any valves to regulate flow and inherently produce unidirectional flow. In addition, the design of this pump is simple, compact and easy to fabricate. Besides that, this pump has potential in pumping fluid with minimal contamination because the pumping unit is small in size and it does not require a seal and bearing. Furthermore, it has the potential in generating a higher flow rate as compared to the conventional reciprocating pump. The final RBP is 19.5 mm long, has a diameter of 18.8 mm and weighs less than 25 grams. In this research project, a mathematical model has been developed with some assumptions and simplifications to reveal the working principle and to evaluate the performance of the RBP. It also enables the prediction on the instantaneous flow rate and pressure variations upstream and downstream of the RBP. In addition, parametric studies have been conducted to determine the effects of the weight of the ball and thesize of the pumping unit on its performance. In addition, parametric studies show that the optimal RBP has a casing length of 11.5 mm, a ball of diameter 9.6 mm with a rear cap hole diameter of 8.5 mm. CFD simulation with fluid-structure-interaction (FSI) of the RBP has been successfully conducted via ANSYS-FLUENT by using moving and deforming dynamic mesh model with user-defined-function (UDF). Asides from revealing the working principle and the performance of the RBP, CFD simulation also shows the working principle of the RBP in a more comprehensive manner through the pressure distribution and velocity flow field. Subsequently, the functionality of the RBP has been verified by experimental studies. In addition, a modified test rig was used to conduct flow visualization experiments. The mathematical model and CFD simulation have been validated by the experimental performance characteristic and flow visualization studies as they agree qualitatively with the results obtained from both mathematical model and CFD simulation. The three studies show that the RBP generates additional induced flow especially during its backward stroke even though the RBP is operated at a back pressure of as high as 1000 Pa. This proves that the RBP is superior to a conventional reciprocating pump having the same dimensions. The RBP has a flow efficiency of as high as 172.15%, 170.88% and 159.90% which are measured through mathematical model, CFD simulation and experimental studies respectively. DOCTOR OF PHILOSOPHY (MAE) 2013-06-06T07:49:31Z 2013-06-06T07:49:31Z 2013 2013 Thesis Lieu, C. F. (2013). Design of a miniature pump. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/53650 10.32657/10356/53650 en 249 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Mechanical engineering::Fluid mechanics Lieu, Chee Fui Design of a miniature pump |
| title | Design of a miniature pump |
| title_full | Design of a miniature pump |
| title_fullStr | Design of a miniature pump |
| title_full_unstemmed | Design of a miniature pump |
| title_short | Design of a miniature pump |
| title_sort | design of a miniature pump |
| topic | DRNTU::Engineering::Mechanical engineering::Fluid mechanics |
| url | https://hdl.handle.net/10356/53650 |
| work_keys_str_mv | AT lieucheefui designofaminiaturepump |