CN103021235B - Reynolds number test method - Google Patents

Abstract

The invention discloses a Reynolds number test method and relates to the technical field of test teaching. The Reynolds number test method is characterized by including steps of 1, adding tracing liquid; 2, connecting a tracing valve and a hose; 3, mounting a tracing needle; 4, adjusting perpendicularity of the tracing needle and concentricity of the tracing needle and a test tube; 5, adding fluid into a measuring system; 6, stabilizing the measuring system; 7, switching on a flow adjusting gate valve, adjusting flow velocity to a required value, finely adjusting the tracing valve at the bottom of a liquid storage bottle, adjusting the opening of the flow adjusting gate valve after flowing is stable, and recording data when observing a straight red thin flow; 8, slowly increasing opening of the flow adjusting gate valve, and recording flow value when the red thin flow starts fluctuating; and 9, recording the flow value when the red thin flow breaks into sections of red thin flows and immediately disperses in the whole test tube in a mist manner with increase of the flow velocity, and completing the test.

Description

The experimental technique of Reynold's number

Technical field

The experimental technique of Reynold's number relates to experimental technique technical field.

Background technology

Reynold's number is the accurate number that judges flow pattern, if fluid at straight shape Flow In A Circular Tube, Reynold's number can be represented by the formula:

$\mathrm{Re}=\frac{\mathrm{du\ρ}}{\mathrm{\μ}}$

In formula, Re---Reynold's number, zero dimension; D---ips, mm;

U---rate of flow of fluid, m/s; ρ---fluid density, kg/m ³;

μ---fluid viscosity; Pas.

For the particular fluid under uniform temperature, at specific Flow In A Circular Tube, Reynold's number is only relevant with rate of flow of fluid.

By newton law of viscosity:

$\mathrm{\τ}=\mathrm{\μ}\frac{\mathrm{du}}{\mathrm{dy}}$

In formula, μ---fluid viscosity; Pas; Y---pipe is vertical range radially, mm;

U---rate of flow of fluid, m/s.

The size of shear stress is directly proportional to the velocity gradient of flow direction to vertical vertical, and the viscosity, mu intrinsic to fluid is relevant, known, due to the viscosity difference of different fluid, fluid, when mobile, flows ducted, and the flow velocity on the each concentric circles of caliber direction is all not identical.

Conventionally reynolds test instrument is to be added water in constant voltage tank by pump, keeping under the state water pressure invariableness of water spill-over stream, by spike then the tracer agent in the traced fluid storage tank on top, areas of permanent pressure injected in Reynold's number experiment tube by syringe needle, can observe the various flows deformation of fluid mobile laminar flow, excess flow and turbulent flow (also claiming turbulent flow) in pipe, record data calculate the measured value of Reynold's number.

The reynolds test instrument of prior art, Chinese patent (or patented claim) 200710049057.0,201020215878.4,201020284487.8,200820107489.2,200410025778.4,89204903.0 and " Experiment of Principles of Chemical Engineering " (21 century institution of higher learning's teaching material, Science Press, Mu Zonggang chief editor) in experimental teaching material all unexposed how to make to test spike syringe needle with experiment tube keeping parallelism, test the technical scheme of spike syringe needle in experiment tube center; The Reynolds experiment device now using is also because spike pin and experiment tube are difficult to concentric, and spike pin is given and is ensured its verticality very much, the elongated flexible distortion of the thin syringe needle of spike syringe needle tube wall besides, therefore, the experiment that college student does at present is only called---Reynolds lecture experiment, the Reynold's number deviation of measuring is very large, and " Reynold's number " also recording by existing Reynolds experiment device cannot reflect the pattern of flow of fluid, can only be Reynolds lecture experiment.

Summary of the invention

The deficiency existing for prior art, one of object of the present invention spike syringe needle and experiment tube keeping parallelism; Two of object is to make to test the problem of spike syringe needle in experiment tube center; Three of object is the problems that solve the flexible distortion of elongated syringe needle.For the present invention that achieves the above object adopts following technical scheme:

One, reynolds test instrument

1, reynolds test instrument comprises: traced fluid storage bottle 1, spike bottle rack 2, constant voltage tank 3, intake chamber 4, overflow groove 5, upper hose 6, run-down pipe 7, rising pipe 8, spinner-type flowmeter 9, surplus valve 10, flow regulation gate valve 11, low level hopper 12, ebullator 13, pump discharge valve 14, pump inlet valve 15, low level hopper outlet valve 16, movable framework 17, experiment tube 18, the experiment mouth of pipe 19, upper and lower spike needle holder 20, spike pin 21, traced fluid stream guiding tube 22, spike valve 23, spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44, the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotation tight fixed bolt 208, straight shape bolt hole 371, expandable washer 372, support locknut 373, support tight fixed bolt 207, it is characterized in that: traced fluid storage bottle 1 bottom connects spike valve 23, traced fluid storage bottle 1 is positioned on spike bottle rack 2, spike bottle rack 2 is welded to connect in constant voltage tank 3 tops, spike valve 23 connects traced fluid stream guiding tube 22, low level hopper 12 bottoms connect low level hopper outlet valve 16, low level hopper outlet valve 16 connects upper hose 6, pump inlet valve 15 ebullators 13 are housed on upper hose 6, pump discharge valve 14, ebullator 13 is between pump inlet valve 15 and pump discharge valve 14, upper hose 6 connects intake chamber 4 bottoms, overflow groove 5 bottoms connect run-down pipe 7, experiment tube 18 connects rising pipe 8, spinner-type flowmeter 9 is housed on rising pipe 8, flow regulation gate valve 11 is housed on rising pipe 8,

Overflow groove 5 bottoms connect run-down pipe 7, and surplus valve 10 is housed on run-down pipe 7, and run-down pipe 7 outlets are positioned at low level hopper 12 tops; All uncovered rectangular parallelepiped tanks in top of constant voltage tank 3, intake chamber 4 and overflow groove 5, intake chamber 4 and overflow groove 5 are all positioned at constant voltage tank 3 right sides, intake chamber 4 is against the right plate washer of constant voltage tank 3, overflow groove 5 is against intake chamber 4, intake chamber 4 tops are lower than overflow groove 5, overflow groove 5 tops are lower than constant voltage tank 3, and described intake chamber 4 and overflow groove 5 are wide, the width of intake chamber 4 and the equal < overflow groove 5 right side plate washers of overflow groove 5 width;

The described needle holder of spike up and down 20 is identical two covers of shape scantling, and upper and lower spike needle holder 20 is individually fixed in middle and upper part and the middle and lower part of constant voltage tank 3 left plate washers; Traced fluid stream guiding tube 22 connects spike pin neck 41, spike pin 21 is fixed on upper and lower spike needle holder 20 by spike needle tubing card 205 and pipe clamp tight fixed bolt 206, spike pin mouth 44 is arranged in the experiment mouth of pipe 19, spike pin mouth 44 bottoms are lower than testing on the mouth of pipe 19 along surface level, spike pin 21 is concentric with the experiment mouth of pipe 19, experiment tube 18, and the experiment mouth of pipe 19 connects experiment tube 18;

The described needle holder of spike up and down 20 comprises the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotation tight fixed bolt 208, the left plate washer 201 of constant voltage tank connects pivot arm bearing 202, pivot arm bearing 202 connects pivot arm 203 by rotation tight fixed bolt 208, pivot arm 203 is by support tight fixed bolt 207 connecting angle iron supports 204, and spike pin 21 is fixed on angle iron bracket 204 by pipe clamp tight fixed bolt 206 and spike needle tubing card 205.

2, described reynolds test instrument, is characterized in that: described experiment tube 18 is straight shape smooth glass pipe.

3, described reynolds test instrument, is characterized in that: the described experiment mouth of pipe 19 is upper wealthy lower 45 ° of narrow oviducts, and the caliber of the caliber=experiment tube 18 at the bottom of oviduct connects experiment tube 18 at the bottom of the oviduct of the experiment mouth of pipe 19.

4, described reynolds test instrument, is characterized in that: on described pivot arm 203, have straight shape slotted hole 371, support tight fixed bolt 207 with support locknut 373, angle iron bracket 204 to be connected with pivot arm 203 by expandable washer 372 through straight shape slotted hole 371.

5, described reynolds test instrument, is characterized in that: described pivot arm bearing 202 is welded to connect with the left plate washer 201 of constant voltage tank.

6, described reynolds test instrument, described spike pin 21, it is characterized in that: spike pin 21 is by spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44 forms, the cylinder boss that spike pin neck 41 is thin-walled, spike needle tubing 42 is smooth straight shape cylindrical tube, caliber=the 0.3mm of spike needle tubing 42, external diameter=the 2.3mm of spike pin neck 41, thickness=the 3mm of spike needle tubing wall 43, spike pin mouth 44 tops and spike pin main body are isometrical, the attenuation gradually of bottom tube wall, spike pin mouth 44 tube walls are bell, external diameter=the 2.3mm of spike pin mouth 44 endpiece.

7, described reynolds test instrument, is characterized in that: described spike pin 21 is stainless steel material.

Two, the experimental technique of Reynold's number

1, the experimental technique of Reynold's number is tested by following steps, it is characterized in that:

Step 1: close spike valve 23, red ink is added in traced fluid storage bottle 1;

Step 2: spike valve 23 is connected with traced fluid stream guiding tube 22;

Step 3: spike pin 21 is placed in to the spike needle tubing card 205 on angle iron bracket 204, with 206 tightenings of pipe clamp tight fixed bolt; Pivot arm 203 use rotation tight fixed bolts 208 are connected with pivot arm bearing 202, in the straight shape bolt hole 371 of pivot arm 203, penetrate support tight fixed bolt 207 and add expandable washer 372, angle iron bracket 204 is connected to cover upper bracket tight fixed bolt 207 pretensions with pivot arm 203;

Step 4: regulate the verticality of spike pin 21 and the concentricity with experiment tube 18; Unscrew rotation tight fixed bolt 208, rotation pivot arm 203, loosening support tight fixed bolt 207, is adjusted to correct position by angle iron bracket 204, even if spike pin 21 is concentric with experiment tube 18, and after vertical with surface level;

Step 5: connect traced fluid stream guiding tube 22 and spike pin neck 41;

Step 6: water is full of to low level hopper 12, record water temperature, then close pump discharge valve 14 and flow regulation gate valve 11, start ebullator, then open pump discharge valve 14, water is after upper hose 6 fills intake chamber 4, overflow into constant voltage tank 3, treat that constant voltage water level 3 constantly rises, until got back to after low level hopper 12 by overflow groove 5 overflows, open flow regulation gate valve 11, current in constant voltage tank 3 are through experiment tube 18, flow back in low level hopper 12 through spinner-type flowmeter 9 and flow regulation gate valve 11 again, the size of discharge, regulated by flow regulation gate valve 11, available pump outlet valve 14 is controlled the spillway discharge of overflow groove 5,

Step 7: a little turn-on flow rate regulation gate valve 11, flow velocity is adjusted to needed value, finely tune again the spike valve 23 of traced fluid storage bottle 1 bottom, the flow velocity that makes tracer agent in traced fluid storage bottle 1 inject flow velocity and experiment tube 18 body fluid adapts, (being generally advisable a little less than the flow velocity of body fluid); After stablizing wait flowing, the aperture of adjust flux regulation gate valve 11, observes the central axis at experiment tube 18, occurs a straight red fine rule stream;

Step 8: the aperture of enlargement discharge regulation gate valve 11 lentamente, discharge is steadily gently increased, the flow velocity of experiment tube 18 also increases thereupon reposefully, correspondingly suitably regulate the aperture of ebullator 13 outlet valves, to keep in constant voltage tank 3 by the outside overflow of overflow groove 5, to guarantee that the fluid in experiment tube 18 is always steady flow, the red thread linearly flowing on observation experiment pipe 18 central axis, when the aperture of slow raising flow regulation gate valve 11, red thread starts to fluctuate, and records first-class value;

Step 9: along with the increase of flow velocity, the degree of fluctuation of red thread also increases thereupon, eventual failure becomes a section red thread, in the time that flow velocity continues to increase, tracer agent red ink enters after experiment tube 18, is immediately smoke-like and is dispersed in whole experiment tube 18, and then rapidly and main body current mix as body, whole tube fluid is dyed for redness, so that cannot distinguish the streamline of red ink, record second value;

Step 10: close ebullator 13, close spike valve 23, flow regulation gate valve 11;

Step 11: open exhaust-valve 17, emit the light red fluid of the mixing of 12 li of low level hoppers, complete experimental implementation.

Brief description of the drawings

Fig. 1: reynolds test instrument front view;

Fig. 2: reynolds test instrument A-A broken section enlarged drawing;

Fig. 3: B is to partial enlarged drawing;

Fig. 4: spike pin 21 profiles;

Fig. 5: the flow state schematic diagram of fluid in pipe;

In figure: 1 traced fluid storage bottle, 2 spike bottle racks, 3 constant voltage tanks, 4 intake chambers, 5 overflow grooves, 6 upper hoses, 7 run-down pipes, 8 rising pipes, 9 spinner-type flowmeters, 10 surplus valves, 11 flow regulation gate valves, 12 low level hoppers, 13 ebullators, 14 pump discharge valves, 15 pump inlet valves, 16 low level hopper outlet valves, 17 movable frameworks, 18 experiment tubes, the 19 experiment mouths of pipe, spike needle holder Shang Xia 20, 21 spike pins, 22 traced fluid stream guiding tube, 23 spike valves, 41 spike pin necks, 42 spike needle tubings, 43 spike needle tubing walls, 44 spike pin mouths, the left plate washer of 201 constant voltage tank, 202 pivot arm bearings, 203 pivot arms, 204 angle iron brackets, 205 spike needle tubing cards, 206 pipe clamp tight fixed bolts, 207 support tight fixed bolts, 208 rotation tight fixed bolts, 371 straight shape bolts hole, 372 expandable washers, 373 support locknuts.

Beneficial effect

1, overcome in the Reynolds experiment device of prior art, due to the concentricity of spike pin and experiment tube, and the verticality of spike pin is difficult to regulate fixing, therefore, the conclusion drawing judges that with actual the Reynold's number dispersion of fluid pattern of flow is very large, and problem on the low side, applies after device of the present invention, experiment can with match with the Reynold's number that judges fluid pattern of flow;

2, overcome in prior art in Reynolds experiment device, the flexible experiment conclusion Reynold's number causing of spike pin is significantly smaller than the problem of the Reynold's number decision content of fluid pattern of flow;

3, by making student in experiment, regulate spike pin, can deepen the impact of fluid mobile suffered each factor in pipeline, deepen the understanding of fluid flow type and newton law of viscosity;

4,, by the experiment of apparatus of the present invention, further confirm the decision criteria-Reynold's number of fluid pattern of flow.

Embodiment

Below in conjunction with drawings and Examples, reynolds test instrument is described further

Embodiment 1

One, reynolds test instrument

1, reynolds test instrument comprises: traced fluid storage bottle 1, spike bottle rack 2, constant voltage tank 3, intake chamber 4, overflow groove 5, upper hose 6, run-down pipe 7, rising pipe 8, spinner-type flowmeter 9, surplus valve 10, flow regulation gate valve 11, low level hopper 12, ebullator 13, pump discharge valve 14, pump inlet valve 15, low level hopper outlet valve 16, movable framework 17, experiment tube 18, the experiment mouth of pipe 19, upper and lower spike needle holder 20, spike pin 21, traced fluid stream guiding tube 22, spike valve 23, spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44, the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotation tight fixed bolt 208, straight shape bolt hole 371, expandable washer 372, support locknut 373, support tight fixed bolt 207, it is characterized in that: traced fluid storage bottle 1 bottom connects spike valve 23, traced fluid storage bottle 1 is positioned on spike bottle rack 2, spike bottle rack 2 is welded to connect in constant voltage tank 3 tops, spike valve 23 connects traced fluid stream guiding tube 22, low level hopper 12 bottoms connect low level hopper outlet valve 16, low level hopper outlet valve 16 connects upper hose 6, pump inlet valve 15 ebullators 13 are housed on upper hose 6, pump discharge valve 14, ebullator 13 is between pump inlet valve 15 and pump discharge valve 14, upper hose 6 connects intake chamber 4 bottoms, overflow groove 5 bottoms connect run-down pipe 7, experiment tube 18 connects rising pipe 8, spinner-type flowmeter 9 is housed on rising pipe 8, flow regulation gate valve 11 is housed on rising pipe 8,

Overflow groove 5 bottoms connect run-down pipe 7, and surplus valve 10 is housed on run-down pipe 7, and run-down pipe 7 outlets are positioned at low level hopper 12 tops;

All uncovered rectangular parallelepiped tanks in top of constant voltage tank 3, intake chamber 4 and overflow groove 5, intake chamber 4 and overflow groove 5 are all positioned at constant voltage tank 3 right sides, intake chamber 4 is against the right plate washer of constant voltage tank 3, overflow groove 5 is against intake chamber 4, intake chamber 4 tops are lower than overflow groove 5, overflow groove 5 tops are lower than constant voltage tank 3, and described intake chamber 4 and overflow groove 5 are wide, the width of intake chamber 4 and the equal < overflow groove 5 right side plate washers of overflow groove 5 width;

The described needle holder of spike up and down 20 is identical two covers of shape scantling, and upper and lower spike needle holder 20 is individually fixed in middle and upper part and middle and lower part (for the fixing spike pin 21) of constant voltage tank 3 left plate washers;

Traced fluid stream guiding tube 22 connects spike pin neck 41, spike pin 21 is fixed on upper and lower spike needle holder 20 by spike needle tubing card 205 and pipe clamp tight fixed bolt 206, spike pin mouth 44 is arranged in the experiment mouth of pipe 19, spike pin mouth 44 bottoms are lower than testing on the mouth of pipe 19 along surface level, spike pin 21 is concentric with the experiment mouth of pipe 19, experiment tube 18, (avoid the continuous overflow of fluid in constant voltage tank 3, feed through to the tracer agent being sprayed by spike pin mouth 44 and be affected) experiment mouth of pipe 19 connects experiment tube 18;

The described needle holder of spike up and down 20 comprises the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotation tight fixed bolt 208, the left plate washer 201 of constant voltage tank connects pivot arm bearing 202, pivot arm bearing 202 connects pivot arm 203 by rotation tight fixed bolt 208, pivot arm 203 is by support tight fixed bolt 207 connecting angle iron supports 204, and spike pin 21 is fixed on angle iron bracket 204 by pipe clamp tight fixed bolt 206 and spike needle tubing card 205.

2, described reynolds test instrument, is characterized in that: described experiment tube 18 is straight shape smooth glass pipe.(glass tube transparency is good, is convenient to the variation of the fluid flow state in observation experiment pipe 18, and smooth pipe can make the frictional resistance of tube fluid and tube wall reduce).

3, described reynolds test instrument, is characterized in that: the described experiment mouth of pipe 19 is upper wealthy lower 45 ° of narrow oviducts, and the caliber of the caliber=experiment tube 18 at the bottom of oviduct connects experiment tube 18 at the bottom of the oviduct of the experiment mouth of pipe 19.

6, described reynolds test instrument, described spike pin 21, it is characterized in that: spike pin 21 is by spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44 forms, the cylinder boss (for connecting traced fluid stream guiding tube 22) that spike pin neck 41 is thin-walled, spike needle tubing 42 is smooth straight shape cylindrical tube, caliber=the 0.3mm of spike needle tubing 42, external diameter=the 2.3mm of spike pin neck 41, thickness=the 3mm of spike needle tubing wall 43, spike pin mouth 44 tops and spike pin main body are isometrical, the attenuation gradually of bottom tube wall, spike pin mouth 44 tube walls are bell, external diameter=the 2.3mm of spike pin mouth 44 endpiece.

5, described reynolds test instrument, is characterized in that: described pivot arm bearing 202 is welded to connect with the left plate washer 201 of constant voltage tank.(make its fixation, not loosening.)

6, described reynolds test instrument, is characterized in that: on described pivot arm 203, have straight shape slotted hole 371, support tight fixed bolt 207 with support locknut 373, angle iron bracket 204 to be connected with pivot arm 203 by expandable washer 372 through straight shape slotted hole 371.(be convenient to regulate the lateral length of angle iron bracket 204.)

7, described reynolds test instrument, is characterized in that: described spike pin 21 is stainless steel material.

Embodiment 2

Two, the experimental technique of Reynold's number

1, the experimental technique of Reynold's number, is characterized in that: test by following steps

Step 1: close spike valve 23, red ink is added in traced fluid storage bottle 1;

Step 2: spike valve 23 is connected with traced fluid stream guiding tube 22;

Step 3: spike pin 21 is placed in to the spike needle tubing card 205 on angle iron bracket 204, with 206 tightenings of pipe clamp tight fixed bolt; Pivot arm 203 use rotation tight fixed bolts 208 are connected with pivot arm bearing 202, in the straight shape bolt hole 371 of pivot arm 203, penetrate support tight fixed bolt 207 and add expandable washer 372, angle iron bracket 204 is connected to cover upper bracket tight fixed bolt 207 pretensions with pivot arm 203;

Step 4: regulate the verticality of spike pin 21 and the concentricity with experiment tube 18; Unscrew rotation tight fixed bolt 208, rotation pivot arm 203, loosening support tight fixed bolt 207, is adjusted to correct position by angle iron bracket 204, even if spike pin 21 is concentric with experiment tube 18, and after vertical with surface level; (bolt one weight under available straight line, holds straight line, makes its normal line method naturally drooping regulate track liquid syringe needle 21 verticality);

Step 5: connect traced fluid stream guiding tube 22 and spike pin neck 41;

Step 6: water is full of to low level hopper 12, record water temperature, then close pump discharge valve 14 and flow regulation gate valve 11, start ebullator, then open pump discharge valve 14, water is after upper hose 6 fills intake chamber 4, overflow into constant voltage tank 3, treat that constant voltage water level 3 constantly rises, until got back to after low level hopper 12 by overflow groove 5 overflows, open flow regulation gate valve 11, current in constant voltage tank 3 are through experiment tube 18, flow back in low level hopper 12 through spinner-type flowmeter 9 and flow regulation gate valve 11 again, the size of discharge, regulated by flow regulation gate valve 11, available pump outlet valve 14 is controlled the spillway discharge of overflow groove 5,

Step 7: a little turn-on flow rate regulation gate valve 11, flow velocity is adjusted to needed value, finely tune again the spike valve 23 of traced fluid storage bottle 1 bottom, the flow velocity that makes tracer agent in traced fluid storage bottle 1 inject flow velocity and experiment tube 18 body fluid adapts, (being generally advisable a little less than the flow velocity of body fluid); After stablizing wait flowing, the aperture of adjust flux regulation gate valve 11, observes the central axis at experiment tube 18, occurs a straight red fine rule stream;

Step 8: the aperture of enlargement discharge regulation gate valve 11 lentamente, discharge is steadily gently increased, the flow velocity of experiment tube 18 also increases thereupon reposefully, correspondingly suitably regulate the aperture of ebullator 13 outlet valves, to keep in constant voltage tank 3 by the outside overflow of overflow groove 5, to guarantee that the fluid in experiment tube 18 is always steady flow, the red thread linearly flowing on observation experiment pipe 18 central axis, when the aperture of slow raising flow regulation gate valve 11, red thread starts to fluctuate, and records first-class value;

Step 9: along with the increase of flow velocity, the degree of fluctuation of red thread also increases thereupon, eventual failure becomes a section red thread, in the time that flow velocity continues to increase, tracer agent red ink enters after experiment tube 18, is immediately smoke-like and is dispersed in whole experiment tube 18, and then rapidly and main body current mix as body, whole tube fluid is dyed for redness, so that cannot distinguish the streamline of red ink, record second value;

Step 10: close ebullator 13, close spike valve 23, flow regulation gate valve 11;

Step 11: open exhaust-valve 17, emit the light red fluid of the mixing of 12 li of low level hoppers, complete experimental implementation.

Except the feature described in instructions, be the known technology of one of ordinary skill in the art.

Claims (1)

1. the experimental technique of Reynold's number, is characterized in that: test by following steps

Step 1: close spike valve, red ink is added in traced fluid storage bottle;

Step 2: spike valve is connected with traced fluid stream guiding tube;

Step 3: spike pin is placed in to the spike needle tubing card on angle iron bracket, with the tightening of pipe clamp tight fixed bolt; Pivot arm is connected with pivot arm bearing with rotation tight fixed bolt, in the straight shape bolt hole of pivot arm, penetrates support tight fixed bolt and add expandable washer, angle iron bracket is connected with pivot arm, cover upper bracket tight fixed bolt pretension;

Step 4: regulate the verticality of spike pin and the concentricity with experiment tube; Unscrew rotation tight fixed bolt, rotation pivot arm, loosening support tight fixed bolt, is adjusted to correct position by angle iron bracket, even if spike pin is concentric with experiment tube, and vertical with surface level;

Step 5: connect traced fluid stream guiding tube and spike pin neck;

Step 6: water is full of to low level hopper, record water temperature, then close pump discharge valve and flow regulation gate valve, start ebullator, then open pump discharge valve, water is after upper hose fills intake chamber, overflow into constant voltage tank, treat that constant voltage water level constantly rises, until got back to after low level hopper by overflow groove overflow, open flow regulation gate valve, current in constant voltage tank are through experiment tube, flow back in low level hopper through spinner-type flowmeter and flow regulation gate valve again, the size of discharge, regulated by flow regulation gate valve, the spillway discharge of available pump outlet valve control overflow groove,

Step 7: a little turn-on flow rate regulation gate valve, flow velocity is adjusted to needed value, then finely tunes a spike valve for traced fluid storage bottle bottom, the flow velocity that makes tracer agent in traced fluid storage bottle inject flow velocity and experiment tube body fluid adapts; After stablizing wait flowing, the aperture of adjust flux regulation gate valve, observes the central axis at experiment tube, occurs a straight red fine rule stream;

Step 8: the aperture of enlargement discharge regulation gate valve lentamente, discharge is steadily gently increased, the flow velocity of experiment tube also increases thereupon reposefully, correspondingly suitably regulate the aperture of outlet valve of circulating pump, to keep in constant voltage tank by the outside overflow of overflow groove, to guarantee that the fluid in experiment tube is always steady flow, the red thread linearly flowing on observation experiment tube hub axis, when the aperture of slow raising flow regulation gate valve, red thread starts to fluctuate, and records first-class value;

Step 9: along with the increase of flow velocity, the degree of fluctuation of red thread also increases thereupon, eventual failure becomes a section red thread, in the time that flow velocity continues to increase, tracer agent red ink enters after experiment tube, is immediately smoke-like and is dispersed in whole experiment tube, and then rapidly and main body current mix as body, whole tube fluid is dyed for redness, so that cannot distinguish the streamline of red ink, record second value;

Step 10: close ebullator, close spike valve, flow regulation gate valve;

Step 11: open exhaust-valve, emit the light red fluid of the mixing in low level hopper, complete experimental implementation.